I guess I'd have to say the Studios as well. Outside of RnRC, ToT, and Fantasmic there aren't any absolute 'musts' there right now. (Don't get me wrong, I love the muppets and many of the other attractions - just not as much as the other parks I suppose)
As for AK, I don't know if it makes a difference that I don't have kids, but I find that park to be a very richly rewarding experience. I can easily spend a day wandering the park at my pace, enjoying the details and all of the animal experiences, and really soaking in the Disney atmosphere at what feels like a more relaxed speed. Could be just me, though!