I also think the Mushrooms need a rework. Maybe bringing all three shrooms into one location with a single global instead of three would be a good rework that would make it more usefull. Besides the mushrooms I think druids are fine atm.
You don't need to be ontop of the healing meters to perform well. In my 10man guild I'm however usually ontop unless we have a disc priest with us. But I see no harm in not being first, aslong as the boss goes down it's good enough for me. People who are only playing for ranks won't get high ranks unless the raid takes more damage then it should anyways. It's in fights that are long where I shine, people who just play for ranks usually run oom at the end and I start gaining HPS on them