I did it for a few minutes. It speeds up opening settings and other apps. It is pretty cool, definitely quicker but I have to assume there is a reason we are set to 1x and not .5x. Also, I don't know if it affects anything else somehow
PS if you want a really trippy effect, slow it down to 10x. Trust me haha its quite fun and a nice little prank to pull on friends
I actually don't mind the 1.0x animations.... running them quicker just seems a bit more hectic and jerky. Just let it glide around... you really are saving only fractions of a second.