Keep in mind that grinding really doesn't get profitable until 55+ for the most part (with a few notable exceptions). Also keep in mind that most classes won't get their "bread and butter" abilities/talents until the mid-30s or thereabouts, which makes grinding more painful than it needs to be at lower levels.

Personally, I'd gouge my eyes out with a spork before I tried to grind-level to 70. I am _considering_ doing it for some reputation on my shammies once I hit 66+ but we'll see how that goes.

Honestly, the most enjoyable leveling for me is to quest until you have the instance quests for your level and then go do those, with the occasional loot drop boss farming for decent gear to make up the difference from me completely skipping all the quests in hillsbrad, STV and badlands.