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Healers use a priority system when it comes to their skills, and that includes all skills, not just the healing ones. Healing spells are most important, Shields are situationally second most important, and if those aren't needed then DoTs are used (if they are DPS efficient), and then if none of that is relevant then you stick to your basic DPS spell.
Bottom line is: Healing is your main concern, Overhealing and idling are useless, always be casting, you can work the rest out from there.
That is how healer is played, and anyone not acknowledging it is playing healer badly (Savage and static based premade content aside, that's between you and your party)