Please remember that WHM now has a large number of instant cast heals that show no casting bar. One regen, three AOE heals, three single target heals and several of them have multiple charges. So while it looks like all there doing is cast glare and Medica 2, there may be more to it than that. With a group that is taking minimal damage, the instant heals are more than sufficient to keep the group alive. After that, its DPS to fill the time. If things get messy, I will resort to GCD heals as that will be all that I will have remaining as the instants were used. I try to keep the MT above 75% HP and the DPS above 90%, if there below those numbers I heal instead of DPS. If I know something nasty is coming, I will top everybody off. For me, my little game is to see how much DPS I can do while keeping people as closed to topped off as possible.