The vast majority of the time you spend playing the game is a grind. You are either killing stuff to fulfill a quest requirement or just for XP, collecting stuff for later use or just to sell, producing stuff you don't need to level your tradeskills, killing other players for honor or just because and so forth. The entire premise of the game is built around a grind.
This is not to say it's a BAD game, or even an unpleasant time. Any game you play for more than a few hours involves a grind. With WoW, the key seems to be find a class who's core mechanic is interesting and it will give you the best chance to make it to the end game.