I know how you feel. My DH says every three years, so I got around it this year. I'm going with my youngest daughter and KSBelle (who happens to be my sister).
I know its not the same since she already gave you the fair idea. Lets think of some other things close by to do!!
Children's Musuem in Wichita
Cow Town (if its still open)
Any lake in KS-El Dorado, Milford, Kanopolis, etc
Council Grove for history
Tallgrass Praire National Preserve and Cottonwood Falls
Rolling Hills Wildlife Zoo-you can pretend you are in AK!
Not officially in KS, but close enough to it:
KC-BBQ, Union Station, Worlds of Fun
Omaha-Zoo, great place worth the drive up there
Ozarks and all associated with it
Of course as I type this list I know none of these can replace WDW. I enjoy the planning and the saving. We actually have a seperate savings account just for vacation planning-so then we can do all the fun thing we and the kids want to do or try. Have fun planning!