My 12 yr old daughter and I did that just 8 days ago! Our group of 9 hung in there through most of it, too. They skipped out on Magic Kingdom, though. We did:
AK- Tough to Be a Bug, Safari, Festival of Lion King, Lunch at Tusker House
MGM- Rockin'x2, Tower x2, Mermaid, Indiana Jones, Star Tours, Drew Carrey sound thing,
Epcot- O Canada, Food from Food and Wine, Illuminations, ride w/ Captain in Monorail front car, see start of Wishes from monorail,
MK- Wishes, Splash, Big Thunder, Splash again, Space Mountain, Spectromagic, and back to our room.
CRAZY! FUN! We didn't plan it that way until after Epcot closed and she asked if we could keep going. What the heck!? We were tired the next day, however. I run several miles a day at home and I was really tired from this!

I would consider making it a tradition.
