I'm sick of people living in this fantasy world where high refresh rates are seen as being beneficial for only users who play games. It's a fallacy.
I imagine it would make watching scrolling content (like this forum thread) a bit smoother. Is that the main benefit you see, things like when you use your mouse to grab an app. window and move it across the screen, the motion looks smoother?
I imagine people's sensitivity to this difference varies from 'don't see it' to 'at last!' Like the big 4K vs. 5K resolution at 27" display size debate - knowledgable people honestly comes to shockingly incompatible conclusions.
I wish it was more common to be able to walk into a retail store and see each type of monitor, hooked to a Mac, and play with it awhile to get a sense of whether you the individual can tell much difference. Even then, I wonder if discernment improves with experience over time (like the ability to discern 'noise' in digital photos).
There's a reason Dell have moved their line to 120hz minimum for their office monitors, it increases comfort measurably in use and makes interacting with everything in the OS more responsive.
Part of that might be marketing pressure to differentiate their offering from competitors'. The good brand name 4" 27" display space seems pretty saturated (it's a headache just trying to learn about and contrast all the BenQ 27 and 32" displays against one another, never mind throwing in Dell, ASUS, Viewsonic, LG and Samsung).
Plus at least if your display is 120-Hz, you know that if you ever do decide to game on it, you might benefit.
Oh, got a big question. With the 4K vs. 5K debate, people claim the difference is worse on Macs due to not supporting subpixel anti-aliasing; Macs are made for 110 or 220 dpi and otherwise there's compromise, whereas Windows' performance across resolutions is more consistent. I'm guessing with 60 vs. 120-Hz resolution it doesn't matter whether you're using a Mac or Windows, I don't see how it could, but can someone confirm that?
At least then if you see a 120-Hz display at the store, it doesn't need to be hooked to a Mac.