... Come on Bethesda I can't find any use for this magic other than for war purposes only. I have no followers ...
And you have no problem either.
Think of it like this:
You cannot heal a corpse. What is dead stays dead.
How can you there heal a lost arm or a dead leg?
Maybe the wounded are in the tents for a good reason and because they cannot get healed?
I use healing spells on my follower, on soldiers, town folk, on my horse and on other horses.
And there are quests where you are being asked for healing potions, but you can use healing spells instead, too.