It's not a race, you'll get there when you do.

I've found the initial grind, against the masses, to be slower in this expansion then in Burning Crusade.

But, give it a bit of time, if you want to level up in the least amount of time played, and as there are fewer people in the zones, the time per level will go down. I still have RAF time, so have started Disc Priests and Boomkins for something to do.

In the end, enjoy the ride, its a game so do whatever is most fun to gradually get you to your goals.