I recently made a mistweaver monk on the beta and have been healing the first 2 dungeons with him. I havent gone oom on any boss fight but I usually end the fights with around 20-25% mana. The way I heal is that I drop my statue on the ground, keep renewing mists up on the party, and soothing mists on those who need healing. And use enveloping mists as my chi spender. I also have the glyph for mana tea which I use on cooldown. My main is a resto shaman and I know they are amazing on mana due to lightning bolt but I feel like I wouldnt waste nearly have of the mana I do on my monk without even using mana cooldowns.