FYI, SponsorBlock isn't just for skipping sponsored segments. SB gives you granular control over the sorts of sections you can skip, and it only auto-skips sponsors by default. However:

• There are several categories of section, including intro animation/intermission ("an interval without actual content"), preview (i.e. where the information already exists later in the video), sponsor (a segment made in return for payment from a third party), unpaid/self-promotion (e.g. "buy my merch"), interaction reminder (e.g. "remember to like and subscribe"), and endcards/credits. (There's also "filler tangent/jokes", but I haven't tried this one.)
• For each of these categories, you can choose to disable altogether, show in the seek bar, prompt to manually skip, or auto skip.

So even if you would never want to skip a sponsored segment in your life, the extension still saves a ton of time if you have no/limited interest in watching even just one of the above-listed categories.