The ooc regen seems to top me off well before the next pack on my War. My mate who heals doesn't even bother touching his Cure until I've about 3-6 seconds into the fight . As for that damm carbuncle ugh helps having the healer as a buddy we just let it and the guy behind it die.
As for Line of sight....that's 50/50 healers should be attached to the tanks behind albeit 15-20 yards behind. Tanks still need to be aware of the position of everyone tho.