We do have a lot of AOE spells in M+ rotation; Divine Hymn, Lightwell, Sanctify… For what do you need Circle of Healing?
For Shackle Undead I must agree, it use to be really handy back in SL (and still is for some content, e.g., Theater of Pain, and worked well during Necrotic Wake too when it was M+). Should be baseline spell for sure, instead of being hidden behind talent trees.
In PVP for sure.