As a new player (waited for ps4 version to start 2.0) I'm not sure I could play a tank effectively using a controller.

I'm sure it can be done just not as efficiently as with a keyboard.

So far healing had felt easy but I've only done light groups. I think it will be more difficult once I am in larger groups where a mouse/keyboard would be vastly superior.

My guess would be that PS3/PS4 players trend heavily towards DPS classes where the controller is a good fit.