I have done most if not all vanilla instances and about 2/3 of BC instances. WotLK instances just suck to me. They aren't fun, and are hard to box. So I just do them when I outlevel them and quest about 90% of the time. All my rewards are from quests or crafted. I could not even imagine running an instance multiple times for a percentage that the item even drops while having to move every few seconds and heal through AOE damage. That just doesn't sound fun to me. I really just want to upgrade, so missing an instance isn't as bad as it used to be for me. I didn't box to make WOW work. I wanted to do things that I couldn't do alone.

My suggestion (just my idea) is to do what you can, and skip the rest and have fun a duo near the same level. Make a 70 something and level it with your druid and do the group quests. Nice blue rewards and might be a challenge with only 2 people.