I've never ridden the Astro Orbiter at MK, nor Splash Mountain (but I won't do either because of fear of heights and fear of falling).
I've never done Tower of Terror or RnRC (but I won't do either of those either).
I've only been to a handful of the major things in AK since I've only been there twice and both times for only a few hours at a time.
I've never seen Honey I Shrunk the Audience at Epcot (though when I was a kid I did it's predecsor, Captian E-O) but I think I've done everything else (including Mission: Space which was a bit intense for me.)
I've not seen all the assorted stage shows and I never stop to actually watch the parades (I tend to go on rides during that time.)
I've been to Typhoon Lagoon when it very first opened years ago, but never River Country (now closed of course) nor Blizzard Beach.
I've been to Downtown Disney, PI, Cirque but never Disney Quest.
Last but not least, I've only ever stepped foot in the Wilderness Lodge. Never been to any others. (Not including the monorail ride which technically takes you through Contemporary, but that's doesn't really count.)
We tracked down things we hadn't done at MK earlier this year - things like Toon Town stuff (Goofy's Barnstormer is for kids, 10 seconds long and not worth the line), Country Bears (dear gods, that was awful and you couldn't understand half of what they said. The other half was downright creepy!) and Tom Sawer's Island (fun to kill some time but not a must do unless you have kids). It was fun because we went through the map and specifically made a point to do things we hadn't before or normally didn't.
-m