Long time EQ and WoW gamer. My son is playing warhammer, and seems to like it, but he seems to still be playing a bunch of PvP on WoW. It seems to depend on where his friends are playing today. He vastly prefers the group playing, PvP or PvE.
I am pretty blase on PvP, and usually prefer the adventuring, and exploring parts of the games. Endless grinding does get boring, but something pretty easy to do in solo PvE play, which I get an hour or 2 of at night. I left both EQ and WoW for the main reason that both endgames pretty much revolved around long raid based dungeon work. I neither have the time, nor the interest for 8 hour encounters where a couple of nice items drop for the 20 or so folks involved in the raid. Of course this must be repeated over and over for everyone to get their class based item. Some improvements with some "token" drops in the later expansion which would apply to any class, depending on who the token is turned into.
I am currently playing Lord Of The Rings Online. While I am slow, I have gotten one character to 50, with some areas still to explore over the year or so that the game has been out. There is a new expansion sometime this fall, and I expect to continue to have new areas to see, and experience. There is some minimal PvP, with folks playing monsters against the other folks characters in a controlled area. This really is only do-able at 50, as all the monster characters start at 50, and only learn new skills over time, not levels.
I play LOTRO on a PC, Bootcamp on my MacBookPro, and using Crossover on my iMac, directly from the mac desktop. Being a long term Tolkein fan, this game was a must for me. While it is slower than WoW, its got much nicer graphics, and a generally older crowd playing it than WoW.