If you've got the druids at 85 and have some honour gear then just use them I reckon mate.

I can understand you are feeling a bit disheartened at the moment, but not sure that levelling a new team for a niche role like this is really worth the time. As you mentioned, the druids will heal as well as any of the others (and probably better x5) fulfilling their main role. I guess you can spec them for the free wraths for cheap albeit soft dps and the dots would be annoying I imagine.

As a node defense team you would probably be unbeatable.

I can't imagine you retrieving many flags but good luck trying to kill a druid FC with 4 supporting druid healers :P

Probably the only time you would struggle is in Strand where you woudn't be able to kill the tanks and unfortunately you can't heal them. Saying that, I can't really imagine 5 shockadins being a hell of a lot better here.

If you do want some PvP fun though and you are set on levelling a new group you could always go the FotM DKs They truly are awesomely fun to play.