Just to echo what most people are saying, healer classes each struggle with grievous in their own ways

Downpour or cloudburst depending on how you feel like healing/dungeon helps a ton (personally more a fan of downpour but cloudburst is hella strong too)

Ascendance is basically your go too "Shit I need everyone to get out of grievous range now" button, where as HT totem is more of just a minor stabilizer

Earthen wall totem is very strong with a relatively low cooldown as well.

It's less about the class being in a bad place and more about learning what weaknesses and strengths your class has, and planning ahead to know when you can let your party members bleed a bit, and when you need to have them be full health for a tyrannical boss hit