What do you notice with 144 Hz? Is it just that much more of a solid image?
Fluidity, smoothness. A few years ago I had a 1080p 120hz, while upgrading to 1440p I chose 60hz because I thought it wouldn't be an issue but it it felt like a slide show in comparison, I was used to 120hz. Some people may not notice it, if you're already 60hz it won't be an issue to stay at 60hz. Going backwards though... Aaand there is a reason why vr is 90hz minimum.
For fps shooters tuning your games to run at high frames that match the high refresh rate can help, if you look at frame times in msi afterburner you'll see they are smaller, as racers you'd all agree that even a millisecond advantage is enough to win, being able to use that advantage is another thing (for me lol)
Pixel response time, the lower the more "solid" the image, higher will be more ghosting. Good TN panels are 1ms response time, good IPS panels about 4ms. Some panels of various types can be as high as 15ms or more which can also be noticed by some people.