Restoration druids are a different story since they will try to outlast you while you try to outlast them. They will change into bear form to minimize your damage and when they get low Atlantica online Gold on health they will pop back and use a powerful heal.
If you see a green glow forming around their hands with little leaves it means that they are trying to get off a healing spell so use Hammer of Justice to interrupt them. Take them down with regular melee and seals and judgments.
While they are in bear form their abilities cost rage not mana and they will be regenerating mana while in bear form while you will be using yours up so it ends up being a war of mana efficiency. Keep Blessing of Wisdom up and use Seal and Judgment of Wisdom so you will regain as much mana as possible.
Feral druids are also not too hard since your high armor severally gimps their damage in cat form. And their damage in bear form is not to hard to negate with healing. They will act very similar to a restoration druid, but will not have the extra healing from their talents so it is a little easier.
The key is making sure that your health does not drop to low so they can interrupt your heals when you really need them. Melee them in both forms as quickly as you can and when they shift out to heal, stun them and use Judgment of Command.