Even when I first began, 97 or 98, I thought heal mana was more or less garbage. I only ever used it in the utmost of crappy situations. It is far less useful than any of the other heals when it comes to bang for buck.

Having said that, could it use an upscale? Yeah, probably, but it isn't a game changer if I can go 20 years and likely count on both hands the number of times that I used it. But, maybe I would have used it and lived a few times if it was more like 50 or 80 mana per heal.