I recently played a voidstar match with 4 healers on the other team and 1 on ours. We had to systematically run a train on each healer while using every interrupt and CC at our disposal to kill anyone.
Here's the thing. With so many healers their damage output was laughable. They could not kill us effectively either. We could still kill them with some effort. Once we took down the healers the first time all 4 were never together again. Making killing them exponentially easier. They were slaughtered.
Healers are not a magical unstoppable entity. 99% of the complaints in this thread stem from the fact that healers are hard to kill one on one and that pisses people off. Healers are actually very well balanced in this game compared to some others I have played where they were either unkillable or a complete joke.
Stop sucking.