Some people enjoy the leveling/questing process as much or more than the end game (I'm one of them). I'm also extremely efficient at questing, even without guides. Have that special affinity for knowing exactly how to optimize my routes to complete the maximum number of quests in the shortest period of time. Just ask Rin

Anyway, I tend to get bored/annoyed when I hit 70 unless I have a realistic single-target goal to hit (like an epic flyer) when I get there, so hopefully that won't happen to me in wrath.