I made the jump from 60hz to 144hz a year or so ago, and more recently from 1080p 144hz to 1440p 165hz.
Refresh rate wise, it was night and day.
It felt way more responsive and just all around looked better imo.
Edit: I will mention that if you don’t have a gpu capable of pushing consistent frames that high in your choice of games, it is 100% not worth it.
I exclusively play single player titles.
I feel like the increased frame rates helped with my response times in combat on God of War and Horizon Zero Dawn. If you play games with lock-on targeting you’ll notice it a lot less, but it feels like it’s helped with my tracking a good bit. Could be me perceiving it that way due to the game “appearing” to run smoother.
The faster paced the game is, the more of a difference you’re going to notice. For me it’s a hard preference now, but it’s hard to recommend to someone that hasn’t tried it for themselves, especially if you don’t currently have the hardware to fully utilize it.