Can't help with the microwave interest but here's a thread with lots of one pot ideas:
http://www.campingforums.com/forum/showthread.php?7743-One-pot-mealsYou can make cleanup easier by lining pots and pans with parchment paper for certain dishes but I can't think of much (past grilled and casserole dishes) that can be cooked from beginning to end in a disposable pan.
I will say that I find "nukers" great for cooking boneless chicken and fish/most seafood as well as heating pre-cooked dishes up.
HTH