I think for every famous "freak" player (7s, 8s, 13s, 14s...) out there, there are at least 10 "normal" gauge famous players.
I just go with what feels and sounds best, depending on the guitar. I was quite interested in the Jimmy Dunlop Jr interview a while ago in Guitarist, in which they said that the different type of string, even with the same gauge, can feel and sound quite different. That means there's more to experiment for me! :D