It really is that repetitive all the way to level 80, I'm afraid. Go over there, kill whatever amount of enemies, collect whatever amount of quest items from them, return. In the higher levels there are some variations on the theme, for example instead of just using your own abilities to kill 10x [insert enemy type here] you'll fly over them and drop bombs, or get in a tank, or the enemy will be super-tough and you'll need to group with other players to kill it. But these quests are in the minority, the vast majority being bog standard fetch quests.
And when you get to 80, you'll need to run heroics over and over and over again to get the gear and emblems you need. WoW manages to cover up its repetitiveness well simply due to the sheer amount of things to do in the game, but ultimately it's an MMO, and repetitive grind is the nature of the beast.