Really? Druids might not have the pally beacon trick but they're way more than capable healing Baelroc.

First of all its a fight that's completely healable with the trinity that all healers have, then throw in a druid's 2 extra low cost instant direct heals (swiftmend and nature's swiftness) that are up every time you need to gain stacks for extra stacking and also throw in the very healthy mana regen ability that's instant and doesn't need to be channeled so you can be more liberal with your stacking, and then the extra plus of OOC procs that allow you to efficiently stack faster too. I'm nearly always the healer that has the higher spark stack in my raid. And lets not forget that tank death in this fight is completely brezzable, so you even have the pseudo equivalent to a tank cooldown which you often don't have the luxury of in many fights. Ask your tanks to swap decimation blades (if you 2 tank it) and your rejuv becomes really effective.

The difference in healer flavors/mechanics vs boss mechanics is always dwarfed by player skill and can nearly always be completely mitigated by strat changes.