I couldn't agree more with Mystic Chicanery -- despite the fact that most players consider the "level grind" to be the most boring part of the game, a stodgy run towards the much more interesting endgame, I've found that I tend to invest myself more in my character while actually leveling up, strangely enough, and it seems to me that endgame is the much more boring part of the equation. While leveling, you get a constant meter (literally) of how much your character is progressing, but after 70, progression becomes much more nebulous, and you have to do a lot more poking around for things like enchants and gems.
Of course, the main complaint with the level grind isn't doing it the first time, it's doing it again and again, and thankfully, as Mystic notes, will bring us ten brand new levels to roll through. But maybe I have a bad memory, because even when I do hit 70 with a character, going back to the beginning with a new class or a new faction is a new experience. And Wrathgoing through the same content a second time makes it faster and more interesting to me -- I already know where the hard quest targets are, and I can catch up on lore or secrets that I may have missed.
Each to their own, of course -- maybe you've already leveled all nine classes to 70 and couldn't imagine going back and running through Stranglethorn Vale or Hellfire Peninsula one more time. But I've found that I almost prefer the leveling "grind" -- it seems more core to me, improving the character constantly with an XP meter, than the current method at endgame of raiding your way through the instances for gear upgrades.