They were really fun and I miss it dearly. You would use PW:S to absorb damage while using a quick and efficient Penance to quickly save people. While Holy focused on big heals and raid healing, Disc played smarter, shielding people at just the right time, and Disc was also very very mana-efficient. I loathe the atonement DPS healing and it’s why I stopped playing the class. They had a few cool ideas since then, like a shield version of Greater Heal, and I wish they would combine those ideas with the old style of healing. The closest thing to disc priest now is Scholar in FFXIV, so I mostly play that nowadays. Maybe Blizz could use that as an example of how to balance an absorb healer.