Healing is more reactionary than a typical DPS rotation.
It’s more buff upkeep than pressing certain abilities in a specific order and repeat.
Like, I keep rolling Riptides on the whole party, then Chain Heal so everyone gets 10% extra hp, and Healing Rain off cooldown, and most of the rest of my healing abilities are for “oh snap” moments like Lesser/Greater Healing Wave and Totems like Healing Tide and Spirit Link.
Meanwhile, any DPS class is kinda builder-spender, start again.
Healers don’t play like that generally.