I was talking to a healer friend about this and they mentioned the main problem is that our kit has very little depth and synergy. With a lot of our skills feeling disjointed and not interacting with one another.
They put forward the idea of a healing rotation. A more in-depth way to engage with your kit. Buttons proc-ing other, more powerful buttons that would couple with another third button. This would all be a mix of healing and mitigation with some debuffing/buffing added for extra incentive. A bit more in-depth like the DPS rotation.

I don't know if this has already been thought of or not, just wanted to add their voice to this since they don't come to the Forum.