As I play on a PvP server, I rather liked the fact that BC was a ghost town. I could go anywhere and do anything. You'll have far more quests available than you need to get to 70. If you don't like one, don't do it. There are several quest lines that result in 2-3 person group quests that give better gear, good for leveling. I went all the way to 70, but I could see going to northrend at 68, then just do Howling Fjord and Borean Tundra and you should come out level appropriate to move on.