I think there's such a thing as overdosing. Your concerns about hypercommericalization are valid and worth discussing, but Disney fatigue is Disney fatigue. The resorts were originally intended as respites, not a lifestyle to be lived 24/7. No wonder that the magic is wearing thin.
My family and I go to Disneyland once a year, usually for a three or four-day stay. The months after are filled with reminiscing, and the months before are filled with anticipation--what's different this year? What attractions do the kids want to tackle for the first time this year? Meanwhile, my ten-year-old enjoys being quizzed on Disneyland trivia and watching THE SECRET TOUR dvd, and we occasionally discuss developments gleaned from Micechat around the dinner table. So it's a continuous thread in our lives, but not an overwhelming one.
When I toured the Walt Disney Family Museum, I was struck by the fact that Walt had only two or three pieces of art by Disney artists hanging on his walls at home--and they depicted generic scenes, not Disney images. Gotta find your balance.