This is something that seems to be overlooked by the average BG player. I see too many games were people have less than 20k healing (sometimes zero) at the end. I wonder if they have any heal slotted at all, and whatever healing they did do was most likely by accident.
For the more team oriented players, sharing vigors or mutagen/rapid regen is part of their buff rotation and I implore you to add it to your own if you don't already.
The heal might small and not significant by itself, but during an intense, close fought 15min DM you can have 500k healing just from vigor/regen. Add three other players adding it to their buff rotation and you have alot of group healing without having a dedicated healer (having one is just icing).