You can flip on /pvp at any time if you want that pvp experience. Trust me there's plenty of people who will line up to try to kill you when they see that red name cross anywhere near them, even on a pve server. On my server there's usually a few different PVP things going on at any time if you want to do it while waiting between battlegrounds/raids etc. Southshore vs. Tarren Mill is always a popular one.
The main benefit of non-pvp servers is the huge reduction on grief. HUUUUUUGE reduction on grief. Can't possibly stress that enough.
..(huge)
I play plenty of FPS games, i don't want to play WoW like that 100% of the time. It's an RPG not a FPS *shrugs*.
Besides it's not true pvp unless you can kill everyone
