From my subscriptions:

Prozd Plays Games is a great let's play style channel. He's a voice actor and pretty funny.

NileRed is a chemistry madman who does very interesting experiments.

Technology Connections does deep dives into all sorts of household technologies: dishwashers, heat pumps, electric cars. He also dabbles in film photography, pinball machines, and other stuff I'm definitely forgetting.

Practical Engineering is a very high quality educational channel on civil engineering. Lately he's even started going to work sites and filming projects as they go.

Folding ideas does very well researched video essays. His flat earth video a couple years ago really took off but basically everything he puts out is incredibly interesting.

Tom Stanton doesn't upload much but he does model airplane and custom ebike content mostly.

Jenny Nicholson uploads once or twice a year now with theme park and weird media video essays.

Watched an hour long documentary on the history of the difficulty of making blue LED lights this weekend lol.

Technology Connections, tomm Scott, smarter everyday, and similar channels

star wars/trek/gate lore and detail videos from people like, certifiably I game, metanerdz lore, gateworld

Fantasy world stuff like WH40K and LOTR, leutin09 and nerd of the rings, installation00 and hidden Xperia for halo

I've started watching movie breakdowns of varying types for movies I loved from the 80s onwards from people like media zealot, heavy spoilers, the deep dive

Metal/woodworking videos from people like That Works, Torbjörn Åhman, shurap, michaelcthulu

Shop videos of machining or fabrication from places like clickspring, make it extreme, and This Old Tony

History Time, cgp Grey, Sam o Nella, Bill wurtz

random genres here and there like rctestflite, casual navigation, daniel thrasher, huggbees...

There are clear trends and then you get some random extras.

Lock Picking Lawyer - You’ll quickly realize that locks only keep honest people honest. I even got my own set of practice picks to play around with.
Deviant Ollam - A professional penetration tester. His job is to infiltrate secure facilities then tell them how he did it, so they can improve their security. He takes LPL’s expertise, and puts it into practice. Start with his “I’ll let myself in” talk.
Veritasium - Dude talks at a camera about some niche science and tech concepts.
*Tom Scott - Now retired, so no new videos. Same idea as Veritasium, with a different host.
Technology Connections - Charmingly dorky dude in an t-shirt and blazer explains how everyday items work. Everything from air conditioners to jukeboxes and coffee makers. He’s a big part of why I’m not afraid to troubleshoot my own appliances.
Primitive Technology - Dude goes out into the middle of a forest and builds stuff with nothing but handmade tools. Turn on closed captioning!
Macho Nacho Productions - Retro console modding and emulation, featuring installs and reviews for some of the most popular mods and emulation tools.
Pirate Software - Former Blizzard/Amazon game dev is making his own indie game. There’s also a healthy dose of offensive digital security sprinkled throughout, because he’s also a greyhat hacker.
Practical Engineering - An engineer explains and demonstrates all kinds of engineering concepts, in a simple and easy to follow format. You’ll start seeing examples of his concepts all around you.
Adam Savage’s Tested - Adam Savage (of Mythbusters fame) builds and shows off all kinds of fun stuff. He also has great insight into how to best utilize a bunch of different tools and equipment.
The Modern Rogue - Two professional idiots try not to injure themselves (and often fail) while stumbling through learning everything from simple bar tricks to knife throwing and Mongolian archery. One of the hosts is a magician of some repute, so there are occasional bits of illusion and sleight of hand thrown in too. It’s basically “what would happen if a couple of dads tried to teach themselves how to make ninja stars in a garage?”
William Osman - Dude with programming and electrical engineering experience uses it to create a musical bidet, and other equally dumb things.
Michael Reeves - See above. He’s friends with William Osman, and they often collab.
Dropout - The old CollegeHumor production crew. They have a variety of content. Game Changer is my personal favorite; Contestants compete on a game show where the rules change with every episode, and the contestants aren’t told what the new rules are.

Lock picking lawyer

Internet Comment Etiquette- fellow over 30 dude making consistently hilarious videos lambasting shitty internet trends

Civvie11 - fellow over 30 dude making consistently hilarious videos showcasing boomer shooters, both good and bad

Climate Town - Looks at fossil fuel propaganda with humour

Everday Astronaut - This guy loves space. Contagious joy but also in depth. He also got a ticket to space. Where I go for space news, docs, and live streams.

Half as interesting - Short interesting videos

Kurzgestagt - what if or how science questions

Minute Earth - very short biology videos

Minute Physics - very short physics videos

Not Just Bikes - urbanism and will help you see how cities can be better and what's stopping it

Practical Engineering - Engineering explained

Primative Technology - Guy build stone age shit in the forest

The B1M - Short docs about buildings

Tomorrow's build - Short docs about future building.

Just started to get into land restoration and binge watched: Shaun Overton Dustups

!landrestoration@lemm.ee going to plug a community I'm going to try get off the ground in the next few weeks.

A few picks

• Clickspring
• this old Tony
• bigglivedotcom
• deviant ollam
• leitnerjoe
• clownc0re
• nibbles and bytes
• aging wheels
• bad obsession motorsport

Mostly cooking videos. Some channels I enjoy are

• J Kenji Lopez Alt
• Ethan Chlebowski
• Adam Ragusea
• Imamu Room

The other half of the time, I'd probably be listening to a Lex Fridman interview.

• Project Farm
• Lock Picking Lawyer
• History Matters
• GeologyHub
• Corridor Crew
• B1M
• Kurzgesagt
• Dave's Garage
• Mattias Wandel

... and many others that are a lot more hobby specific...

Kurzgesagt
Last Week Tonight
Veritasium
Map Men
Rob Words
Mr.Ballen
melodysheep
Space Matters
Technology Connections

These are the ones I watch regularly. Most of these channels offer educational content.

Great suggestions here, but no mention of SuperfastMatt. Speaks to the engineer in me by collecting projects and overcomplicating them all.

Adam Savage's Tested, watching his videos finally got me to start working on my 3d printing and costuming.

• Ashens

• Atomic Shrimp

• Blame Society

• Caitlin Doughty

• Channel Awesome

• Cinemassacre

• Comedy Central Stand-Up

• Count Dankula

• Creamofcardstv

• Disturban

• Doctor Wolfula

• Doctor Todd Grande

• Dominic Noble

• Eli Fieldsteel

• Fanboy Flicks

• Fastpass Facts

• Fireship

• Fran Blanche

• Funny or Die

• GLITCH

• Georg Rockall-Schmidt

• Grand Illusions

• hak5

• hate5six

• hotdiggedydemon

• ill will press

• Izzzyzzz

• Jason Brant

• Kurzgesagt

• LADbible

• Last Podcast On The Left

• MEpearl

• Mental Outlaw

• NBTV

• Neil Miles

• Nostalgia Nerd

• Octavius King

• Perry Carvello

• Philosophy Tube

• Plainly Difficult

• Project MSTie

• QueenofVHS

• Randi Rain

• Real Stories

• Rena Malik MD

• Rob Gavagan

• Screen Rant

• Sisyphus 55

• Soft White Underbelly

• SomeOrdinaryGamers

• Stoned Gremlin Productions

• TLDR News

• TPM vids

• TechMoan

• The Carpetbagger

• The Foot of Our Stairs

• Timeline history documentaries

• Today I Found Out

• Ushanka Show

• Weird History

• William McDaniel

Seconding (thirding, etc)

• Adam Savage's Tested - cosplay, engineering challenges, interviews with makers

• Project Farm - no nonsense tool/equipment tests

• Bad Obsession Motorsport - two guys taking WAY too long building an old mini into a rally car

• Primitive Technology - John Plant building cabins and clay tiles and basic iron smelting in the Australian woods. No talking at all, but turn on subtitles to find out what he's doing

Stuff I didn't see recommended:

• James May's The Reassembled - Top Gear's Captain Slow putting things back together. Very ASMR

• What's Next - the new name for Drive Tribe, the Top Gear guy's video channel. I love the series where they send their curmudgeonly producer on last minute international travel to shoot ad hoc travel shows

• TASKMASTER - a British TV show where celebrities you've probably never seen before make their way creatively through challeneges

My subscriptions in no particular order:

Cathode Ray Dude
Perun
Ordinary Things
LazerPig
Well There's Your Problem
Kurzgesagt
Münecat
Veritasium
Map Men
Practical Engineering
Task & Purpose
Todd In The Shadows
Intergalactic Binman
Lord Hardthrasher

Oceanliner Designs - lots of interesting videos about titanic & other ships of that era.

Caitlin Doughty/ask a mortician - lots of cool video essays about death

B1M - lots of cool engineering related videos

Evan & Katelyn - lots of cool resin creations.. gives me cooking channel vibes where after watching a video, i have an intense urge to make things i dont need.

Well Theres Your Problem - a podcast about engineering disasters… with slides

Tasting History with Max Miller - a cooking channel that is also a history lesson.. super cool

In addition, just a bunch of urban planning youtube (city beautiful/city nerd/oh the urbanity, etc) & video game content

The occasional home repair or maintenance video.

That's it.

It's super nerdy and technical, lord knows I probably don't understand a good half of what he talks about, but CuriousMarc's channel. I don't think I've been as fascinated about anything more than his ongoing series to get the Apollo Guidance Computer and other Apollo systems from the original moon missions working again.

One of my current favorites is Robot Cantina.

He transplants lawnmower engines into regular cars and tries to make them go as fast as possible in various ways.

I enjoy Summoning Salt 's channel. Talks about the history of speed running video games. Get a hit of nostalgia with a lot of "Oh wow, I didn't know you could break a game like that".

I can recommend doshdoshington, if you like games

"the hoof GP"

Idk dude I fell down a rabbit hole one day but it's perfect before bed

I'm over 40.

Beau of the Fifth Column has a fantastic perspective on politics and world events, and is a great presenter. Politicon with James Carville, The Bulwark (for sane conservatives), The Daily Show, Last Week Tonight.

Perun makes entertaining PowerPoints on the nature of global conflict and defense.

Frasier Cain, Event Horizon, SciShow Space, Cool Worlds, PBS Spacetime, Isaac Arthur for space and science.

For comedy I like Taylor Tomlinson, Liz Miele, Sam Morril, Norm MacDonald, Josh Johnson.... look, there are a lot of great comedians out there.

So many musical virtuosos to discover. Charles Berthoud, Justin Johnson, Bill Sutton, Doreen Ketchens, Too Many Zoos.... just go find great musicians. It ain't hard.

Professor of Rock, Team Coco, Adam Savage, Forgotten Weapons, InrangeTV, The Prehistory Guys, Stefan Milo, PBS Eons, Fall of Civilizations, Kyle Hill, Advoko MAKES, Primitive Technology, NileRed, ClickSpring, my mechanics, sreetips, Cody'sLab, shurap, Corridor Crew...

I waste way too much time on YouTube, you guys.

Explaining Computers
Digital Foundry
Summoning Salt
Carwow
Photo Owl Time Lapse
GCN
GCN Racing
Formula 1
The Slow Mo Guys
Dave's Garage
Flossy Carter
First We Feast
Ahoy (@XboxAhoy)
Steve Mould

A bit of an outlier but I find myself watching quite a lot of DarkViperAU. I got into his stuff from watching his very amusing series where he tries to complete GTA 5 as a pacifist, but he also does a regular "rambles" series where he just chats shit about current events, while being fully aware of his own field of knowledge and being careful not to step outside his remit. On the occasion that he does and he gets something wrong, he fully owns the mistake and admits his shortcomings. It's very refreshing!

You might be vaguely familiar with him if you're aware of the ongoing drama around reaction streamers. He's been railing against them for some time.

• James O'Brien's weekday talk show from the UK. Always intelligent, sometimes witty, and very compassionate.
• Tim Pierce's guitar channel. He is one of the top session musicians in LA, but also a very humble and thoughtful man.
• Michael Popok on the Midas network. Definitely opinionated (leaning left), but he really explains the legal issues around current events (especially the Trump trials) very well
• Space Ice movie reviews. When you can't get enough ridicule of Steven Seagal
• Dr Glaucomflecken: very funny and perceptive views of the American medical system. Every doctor I know loves it

YouTube, for me, what MTV used to be. Music videos and live concerts. That’s all I use it for.

The Post Apocalyptic Inventor. The guys about self sufficiency in machinery and workshop stuff. Pretty fun and relaxing. One of the more genuine and down to earth YouTubers I know for the moment.

I used to watch a significantly more varied selection of things, from Videogames to PBS videos about how itching works, and I still do that from time to time but since the birth of our second child...things changed.

I mainly watch YouTube before I go to bed now (whereas before I'd watch it...to watch it), so I tend to watch a lot of lore breakdown videos, namely for Fromsoft titles or A Song of Ice and Fire.

Lots of Hockey, usually breakdowns about major events in history; trade trees and significant events and the like.

I also watch a fair bit of Politics-tube and general videogame stuff.

If I had to recommend five or six:

Game Makers Tool Kit - Videogame deepdives.

VaatiVidya - Fromsoft lore.

In Deep Geek - ASOIAF lore.

Hockey Physiology - Hockey.

Kurzgesagt - Explainers from Space to microbes.

Sam Backman - Android Apps/Tech.

Mr Beat - Teacher who does President Videos (I'm a nerd).

Icethetics - Hockey uniforms,logos etc etc.

Map Men - They do videos about Maps.

Lessons From The Screenplay - Film and TV writing.

Now You See It More Film and TV.

Vox - General video covering...well everything.

TLDR News - UK Politics

• GeoWizard: Maybe famous for his Geoguessr content, but he also makes really fun "Missions", where he for example crosses a country in a completely straight line.
• Small brained american: travel blogger, funny and still meaningful. He even goes to places like Ukraine and Iraq.

A lot of the other ones people have shared, but also: Professor Lando and The Hydraulic Press Channel.

Synthesizer news and reviews, Dark Souls streams (Lobosjr is the only streamer I can tolerate), 80s and 90s music videos, cute cat videos, Rush covers, gadget teardowns, soldering videos.

Edit: Almost forgot robot sumo.