If you aren't aware that this quest was daily, and only visited the Peak of Serenity for class quests every ten levels, you should get on board! It's easy to do -- just cast Zen Pilgrimage every day and spend a couple of minutes sparring with one of the monk trainers -- and the reward is very much worth it, not only giving you great XP, but also the Enlightenment buff that provides +50% experience from questing and killing. If you're leveling, I don't have to tell you how invaluable that kind of XP buff is. In fact, it's so invaluable, that whenever I've switched to another alt I really miss it. Leveling any other class, no matter how efficient you are with heirlooms and rested bonuses, is slower than leveling a monk.
And all I have to say is... where are the other class quests? Why don't hunters have daily target practice quests? Why don't mages have daily drills in fire, frost, and arcane magics? Why don't warlocks have daily demon duels? And what do you think, dear readers? Do other classes need their own daily quests, or would it just add to the frankly overwhelming pile of dailies we already have?