SaskDisNut - The price isn't exactly half - a little less. Our flights are $470 and the lowest price I found on the days we're flying are $262 total. That's pretty darn good I think. Check it out.
Minneapolis is an eight hour drive from Winnipeg so that's not too bad. I'd love to hear what other people do regarding hotel/parking. Our group doesn't have to stay in a hotel and could just leave their vehicle in long term parking, but I see that parking is $12 - 14 a day.
If any hotels offered long term parking along with a one night stay it might be less.
I see that you've travelled to Disney around the same dates as us. We went in January 1980, February 1987, February 1996 and we're going in May 2008. All our trips to Disney have been to WDW, but my husband has been to
Disneyland numerous time while attending conferences in that area.
Nora