I'd quite like to see a 144hz screen to see what the fuss is about. I do find it hard to believe it could make that much difference. I mean, the maximum latency 60hz over 144hz can add is like 10ms... Considering my best reaction time is around 220ms we're talking 5%
Honestly mate I'll try to explain it but you need to try it to see it properly.
A 120/144 (144 in my case) has been the biggest benefit to my gaming since I upgraded to a decent graphics card and started getting more than 30fps. If you've experience the difference between 30fps and 60fps you'll know that 60fps is a lot easier to aim and such because it's smoother. Well the difference between 60-120/144hz you might not think would make much of a difference but you don't realise how blurry your 60hz monitor gets with fast paced stuff.
For example in CS:GO, frequently you need to do a 180 because someone is shooting you from behind, and you have about 2 seconds to kill them because otherwise you're dead. Well with 60hz, I would spin round and my monitor would go blurry while turning (because refreshing 60 times when the full screen is moving quickly isn't enough to keep it looking clear), then stop turning, my eyes would readjust focus, then I'd try to shoot the guy and by that time I'm dead because the half a second it's taken my eyes to readjust and then re-aim has made me take that little bit longer.
The best way I can describe it is when I got my 144hz monitor I suddenly felt like I was playing in slow motion. Sounds really weird but because it's so buttery smooth it actually feels like that! Aiming feels like it's twice as easy because it never goes blurry so your eyes never need to readjust, it really is epic.
TLDR; just try one and you'll see what we all mean.