Eh? You're not serious I hope. You think quests where you have to kill are not worth doing?! So um, how do you usually level up? You recommend avoiding quests avoiding killing things, so it's very unlikely you kill anything that's not part of a quest.
Man, it must take you forever to hit 70.
The quests not worth doing if you want to level properly are the ones that involve running about for yonks. These quests are among the best in the game. You get tons of xp from killing the mobs and you get some really nice xp from the actually quests themselves.
Some people are just clueless about how to play WoW eh