Good question. On my iPad Pro, I definitely believe it does, since it's right up close and my eyes can better track what's moving.Do you find the 120hz helps you get lost less when scroling through big documents or libraries?
On the laptop, I'm not sure yet. Looks nice and smooth, but of course I'm further away from the display and I've got almost 53-year-old eyes to begin with, and I've only had my 14" MBP for a few weeks, so I'm uncertain as yet. But I'm leaning towards a "yes" since it's similar to what a 'smooth scrolling' setting on a browser might do with a scroll wheel versus jumping up one line at a time.