Jsyk, for the last boss, you can simply say: Pick a gate, and if you see it start to shoot bubbles, go click on it. That's pretty much all there is to that fight, though you can largely ignore that mechanic as well.

It sounds like, while you may not have noticed, you were internally rushing due to other obligations. Your healer could also be wrong, you may want to ask the guy you helped what he thought rather than getting a second-hand take on it.