I absolutely agree that we should not be casting a 2-3 button DPS "rotation" for pitiful contributions of 1/3rd of a red class 80% of the time.
Fill downtime with Risk-attached DPS? Sure that is fun. I always like the fact that a healer basically performs 2 roles in FF XIV and I do not want that to change.
A builder / spender kind of thing is exactly what I do NOT want though. This made the holy priest class in WoW so annoying and frustrating for me. I don't want to cast near meaningless crap as "filler heals". As I already stated: that is by no means more interesting than casting braindead DPS spells.
I still maintain that healers are largely fine and that it is the content itself that is tuned way to lax (savage excluded).