One great way to effectively level is to level more then one class at a time.

Someone said they are grinding mob's just to escape the fates. Ok then why not find a crafting class you need mat's for.

Leather and cloth crafting come to mind for me. You need hides, and wool and stuff like that. Use your lo level classes to grind out the mobs that drop that stuff.

This way leveling don't seem like such a waist of time.