I am 100% sure that MWmonks are classified as melee. You can safely stand in melee range at any boss (well, as safe as any other melee i guess. And that is in general not that safe).
Due to our melee mechanics with fistweaving, we will always be able to get in melee. Its very cheaty as all the other ranged and healers will have to deal with about 60% more abilities that MWmonks.
This goes for Dungeons, Scenarios, LFR, Flex, Normal AND Heroic modes.
Anyone who try to tell you differently can come and find me