The healing still works the same. You do not have to double click. Only if the object being healed is NOT another human player do you have to double click. I can heal bosses, when boss trolls troll in boss rooms, very easily.
However, it would be nice to just triple click the non-human object and be able to continue to toggle my healing bots (with 1, 2, and 3) instead of having to click made crazy. It could allow to focus just on healing the boss and not miss a precious healing bot use when I am being trolled.
And until the vampire gun is fixed, I do not think I will invest in it.