@mgilbert - Short answer, yes. There's a test on the web that compares the same animation, running at different FPS, and while it's not incredible, the difference is still noticeable - on a simple, crude, pixelated loop. Now, if you want to get into more details, here's how it works: while it's true that our eyes can't really tell the difference between different FRAMES at 50Hz and above, there are several factors that cause higher refresh rates to be preferable for most people. The first is simply because even if our eyes can't tell, our brain does. The world isn't rendered at 30, 60 or 120 frames, it's continuous and the higher we get, the more pleasant the experience feels. A lot of people, gamers and non-gamers alike, report that 120 or 144Hz monitors simply feel faster, smoother, and overall better, while admitting that there's no truly visible difference. The second is of course frame time variance, which becomes much less noticeable as the FPS rise. In fact, it's the reason 30 fps in games feels so choppy, while it's perfectly acceptable in movies and series - frames are rendered at the exact same intervals, and our brain isn't bothered by it too much.
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