Seems to be a rather subjective thing. Going from 4k to 1080p literally causes me headaches, going from 240Hz to 60Hz feels normal after a minute or two. Yes, it feels nicer, but that's it for the most part. Not something that makes me want to update the screen right now.
Not something that makes me want to update the screen right now
That about sums it up.
I alternate between 120hz and 60hz monitors depending on where I’m working.
For software engineers: 120hz is “nicer”, and if you are buying a monitor today I’d say it’s well worth it to pay another $100 or whatever to go for 120hz+ versus 60hz. Certainly not worth upgrading for this alone however.
For designers: Same as above but it perhaps leans a little closer to being worth the upgrade. The mouse cursor is noticeably much moother and if you’re doing digital painting or something all day, 120hz+ might really be worth the upgrade all by itself if budget allows. Working with the 120hz (or is it 240hz now?) stylus on iPad Pros is revelatory for that kind of work.
For gaming: For any fast action gaming (for games and platforms that support high frame rates) it really is worth the immediate upgrade. Your world now looks and feels fluid. It feels real. Input lag is usually halved as well.