i skated 7.75s for probably a good 8 years or so. i started skating 8s when my friend was getting hooked up by this company that i think is out of business now, but i would buy boards from him for cheap and he skated 8s. been on 8s and the occasional 8.125 for probably 5 years now. it wasnt much of a difference going up, but i dont think i could go back down. my brother has a 7.75 and it just feels weird skating that now.
what i thought was weird is that when i first started skating in the early 2000s, 8s were big and anything over 8.25 was massive. then starting in the early 2010's it seemed like 8s were the smallest decks most companies would run, with a few 7.75s here and there, and kids all wanted to skate 8.5s.