I have some parts of Mirai's pro setup but I do try to keep my setup fairly simple.
My healing setup on this video is simply WoWs standard raid frames and the addon clique with a very simple repeater region set up through ISBOXER. When classic really gets going I will probs have a more advanced set up done but I started with this on the stress test to get going quickly and I will also run with it for the early dungeons on classic release.
Ive had this question a few times now so in the next couple of days ill make a quick video on how i set this up as its the exact same process on retail so I can get some footage from there.