Honestly, I noticed zero difference and was pretty disappointed. From what I had read, the jump from 60 to 144 was supposed to be dramatic, like a religious experience, even for non-gaming stuff. Nuts, nope.
That's interesting. I am among the category of folks who describe the move as like a religious experience (mostly for gaming than for desktop use, though the difference is noticeable.) I suspect you'd tell the difference using a 144Hz and a 60Hz monitor side-by-side, or going back to a 60Hz primary display. Unless... not to be insulting, just to be sure—you have
set your monitor to 144Hz, right? I have found that it's important to check because sometimes Windows doesn't properly default to the highest refresh rate.
Anyway, as to the actual topic at hand, I would definitely say that a 144Hz display could
reduce eye strain, but I think you're better off looking at options with wide color gamuts and (especially) rich contrast. I find that low contrast TN and IPS displays are the number one thing that causes me eyestrain as I struggle to pick out fine details in images. Another thing I'll say is to simply sit closer, move your monitors nearer to your face (try mounting them on an articulating arm), or buy larger, lower-DPI monitors. Alternatively, buy extremely high-DPI monitors and enable upscaling. Finally, if you haven't in a few years, you should get your eyes checked. I recently got new glasses and the change in my quality of life has been absolutely shocking.