I do not understand, what gameplay advantages PvP server setting has...
Basically, if one wanted to play PvP, they would simply que up in BGs or Arenas, or perhaps Duel in Dalaran...
But, with world pvp enabled, basically any 80lvl stealth class, or even any 80lvl can gank you freerly, corpse spawn you, and one hit you, while you are trying to collect your 4/7 Raptor Meat.
I do not understand? What's the point of having your leveling experience being interrupted, unsolicited, by people who claim to have some measure of skill by pressing 2 buttons?

