I've used GDoc for quite a while now, and I've just gone to VS2012 and the beta, and a few things I've missed:
* On first install, I didn't get any notification asking me about assigning CTRL+SHIFT+D to the GhostDoc command (I realise this might be by design - but I personally like to see this on the first use in a clean install).
* For a method returning bool, could the <returns> xml tags have something like '<c>true</c> if XXXX, <c>false</c> otherwise'
And one suggestion I think might be nice:
* When running Gdoc on a method that is implemented from an interface / base class - could GDoc ask if we'd rather comment the base implementation instead of the derived?