Dual druids should be fine, as you are going to have a ton of options.

If you get tired of running 2 different characters, you can go Boomkin+Boomkin and nuke everything down, plus have a horde of treants in a pinch.

You can certainly do the traditional healer tank setup, a dreamstate type build would be a good fit for the non-feral.

If it was me however, I would go feral feral, with a bear and a cat. I use a warrior and a mele shaman, and have no problems. Look a couple of posts down for how I do it, but basically charge a mob with the bear form druid, walk through so that the autofollowing cat is in mele range with the mob between you, and dps it down. You can match bear and cat abilities almost button for button as well, which will make it really easy. Also, neither one is going to drop as fast, and you can set up a macro to shift and heal on the 2nd character.

Since you won't really need much in the way of heals starting off since mobs are going to be hitting for that much, and they will be dying fast, I would give it a shot, then respec when you need heals for elites and such.