I would disagree with you regarding the grind - I've succeeded in completing all quests on both continents which saved me the grind but you've given me a rather disturbing thought.
Leveling to 60 in vanilla, by doing all the quests, is possible. That's if you count rested exp and the normal exp from mobs, which you bag along doing the quests. And even then, it's really hair thin. I wonder how is it going to be here, since we've half the exp from mobs and rested gives only half exp bonus. That's starting to sound disturbing, but there's no one who has reached 60 with these exps yet to prove us wrong or right.