When you exit the starter zones there are a tremendous amount of kill quests and delivery quests. Duskwood for example has around 20. Dont feel you're forced to dungeon grind from 10-60, because the last time you quested that collection quest took you 1-2 hours. Skip it, there's several zones to choose from with tons of easy multiboxing friendly quests, quests solo players cant benifit from like you can. Quests like Tharil'zun in Redridge mountains that you can do at 18, is easy, and gives you a massive weapon upgrade.