Monks go fast too due to BrM amazing aoe pulls, but around 46 you should switch to WW for Spinning Crane Kick.
Monks also have their class quest on every 10 levels, + daily repeatable, that you can basically save up for 85-90 leveling.
The quests rewards you with a buff which gives you +50% exp for 1hour up to lvl 81 and downgrades to +20% exp buff per hour past lvl 81. The buff is stackable and max number of stacks is 24, maxing it out at +50/+20% exp for 24hours. Add to this looms and guild exp bonuses and it goes really fast.