I'm glad you brought this up. As a timeshare owner I know the value of spreading your wings. When I was a kid, my parents invested in a beachfront condo near us. For the next 15-20 years our only vacations were to the beach. It got very boring even though the condo was considered a second home.
Then we started taking short hotel trips. Eventually that turned into a Marriott vacation club trip, then ownership. Now my dad and I plan 4-5 big trips a year. Two to Disney, one-two elsewhere (Williamsburg the last few years) and one some place new. This year we used Marriott reward points (converted from our vacation club weeks) to stay in London. In the past we've gone on cruises, stayed in Miami, Tampa, St. Augustine, Savannah, Hilton Head, New Jersey, even several stops cross country to Colorado.
I love Disney because it's a great park area and meeting place. But I'd go nuts if that was the only trip I ever took in a year. After the 50th time riding Buzz Lightyear it gets dull.
The one thing that concerns me about DVC is the somewhat poor value they put on trading out to other destinations. It's an expensive ownership in the timeshare world, yet doesn't give members half the travel flexibility as other timeshares like Marriott.