We have done WDW more times than can be mentioned and a few months back when we were there, my 4 year old son kept asking to go home. Quite the vacation. Also, we are taking my 14 and 16 year old neices with us and they say that they are "too old" for Disney but I told them "your never too old" but I think the real reason is that the last time we were there together 2 years ago, their mom (my sister) was with us and she has since passed from cancer and I just think that it will be too painful for the girls. It was painful for me when I went back after she passed.
Since you asked, that's the answer. I am not someone who doesn't enjoy Disney, if I didn't, I wouldn't give them so much of my money every year.