I only wanted to add one thing, since we have a bunch of offsite fans here: consider home rentals for otehr vacations, too. We only do WDW every other year, and on the off years, take a driving trip. Last summer, we spent a week in a farmhouse in Amish country--it was a blast! It was a working dairy farm, my kids got to feed calves, gather eggs, and run around. Next year, we're still considering options, but there are places all over the world where you can rent a house for a week.
I just thought I'd mention it--especially for those of us with larger families.
We do timeshare rentals (our favorite) other places too. Besides renting these in Orlando (I've rented in Orlando maybe six different times), I've rented these in Palm Beach Shores, FL, Victoria, B.C., Sedona, AZ, Cancun, MX, and Puerto Vallarta, MX. I usually find rental on TUG2.net classified ads section or Redweek.com. I'm also a member of TUG2.net for $15 a year even though I don't own a timeshare, specifically so that I can read reviews of timeshares all over the country / world and have a good idea about whether or not I'd like to rent a property. Sometimes I've been a little creative too -- didn't see the week I wanted available for rent, but saw that someone had that week for sale at an inflated price (so I knew their week wouldn't sell), I contacted the person, asked if they'd rent to me, and they did for a good price (let me pay what the resort would have paid them for renting the unit and with me it was a sure thing where as with the resort it wasn't a guarantee).