WOW these ideas are so creative. A few years ago I started my planning in a normal 1/2inch black binder, nothing fancy. My DDs and I have added new stickers to the cover every year, and I used letter stickers to write "Walt Disney World" on the cover. I bought different colored transparent pocket-dividers and use them to seperate my sections, which are:
Travel Info - includes reservation info, and driving/flight plans
Helpful info - kind of empty now, has had tips/ideas in the past, and info on different places to stay - boy was I crazy thinking I would stay off-site!
Parks - includes park hours, must see/do attractions for that year, parade times, height restrictions, closed attractions, our plan on which park to do each day
Dining - our daily plan for ADRs, good counter service places, info on the
DDP
Packing lists - self explanitory
After each trip, I remove the pages and save them in a folder. I think after seeing these great ideas I am going to make something more permanent that I can keep or turn into a scrapbook after the trip.