This is what I use to make it easier for me to heal in raids and etc. its called Heal Bot it tells you how much your gonna heal for that person and if he is getting healed by someone else, therefore you won't have that much overhealing, and therefore you can last longer with mana. You can also cure curses and etc, so you don't really need Decursive addon. Well I thought I should share a part of my secret of healing