Mass healing word is a bonus action spell that heals every friendly creature in range for 1d4+5 hp (1d4+10 on a life cleric). Add "the whispering promise", "boots of aid and comfort" and "hellriders pride", all of which can be found in act 1 to grant all targets you heal the effects of the spells bless and blade ward and 3 temporary hp on top. In my opinion that's very much worth it.
Sure, depending on your party composition you can survive most fights without healing spells. But especially for those fights where you have friendly npcs that you might want to keep alive, a cleric with healing gear is nice to have.
