First of all, sorry for the bad pun for a title. Moving on...
I was watching a video in the Pally video thread entitled "Divine Storm, Seal of Light" and I must say, it was an eye opener. I always knew that they were both really good spells, but the amount of health regeneration he was recieving was fairly obscene.
In the video we see the Paladin taking on groups of about 4 mobs at a time without losing health at all. Also, he didn't run out of mana even with Seal of Light. Depending on how things work out, I may not use Seal of Command if I can achieve these results, too.
I will be honest. I did not read your whole post and at first seemed like a QQ ret is op, look they are able to take multiple mobs np. My bad. "=)
No problem. Also, I felt the need to point out that while Blood Death Knights can achieve high health regeneration, too, it comes from single target damage and killing blows, not specifically AoE damage. While the Ret Paladin's health regen is so high because not only is Divine Storm hitting max targets, Seal of Light is also hitting 4 targets resulting in more regen. That's the only real difference I can think of right now.