I think this came about more from me knowing healing really well on a druid, as I used to raid mainspec one... and liked the idea of steady healing via hots and just macro'ing it in and doing top ups via grid and swiftmend. Wild growth I have a key bound for too. Makes it fairly easy and more or less takes care of itself most of the time.
I've seen a fair few posts about other people using priests as healers and that they are very multi box friendly as healers so might give it a go sometime. I gather a fair few people use druids too.
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