Lets put it this way:
  1. Pick a solo duty where you play as yourself.
  2. Play any one of the 4 healers.
  3. Complete the duty.

If you think that completing said duty is tedious as a healer, congratulations you have now discovered what it feels like to be a veteran healer. That is legit what it feels like when we get good at our job. Yes, there is more healing involved, but frankly? Just healing yourself reflects how it feels (pop a HoT/hit a button you're back to full).