Remove the GCD cost from on-demand healing.

[Payadopa]

I want to be able to use the most basic of my healing tools without sacrificing DPS uptime.
I want the game to subconciously teach new players, from the very start, that DPSing is free and that you should be doing it all the time.

I think you are confusing a DPS who heals with a healer who DPS. It's your job to heal first and DPS second.