You don't heal for as much as you would normally. So while you can normally pull a dozen or so mobs aoe cleave them down and heal up constantly, you can't really do that with the pvp quests.
I'm not a huge fan of pvp anymore either, but while it's not really "pvp" it's more like "go kill these alliance tag'd NPC's" it still seems to flag coding for any pvp change to abilities.