I was 60 last night with 2 days played without doing any instances at all. Many hours of my playtime was also spent messing around with and writing macros because it was my first proper multibox team. And summoning gifted characters to flight locations. I've always been a big believer in doing quests, since it's killing plus bonus exp at the end. With instances you get maybe 20% more exp per kill due to elite mobs, and probably make a lot more money from drops, but 30k exp jumps every quest turn-in are impossible to compete with, and I know getting to 70 quickly is better money these days so you can do dailies.