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).
) saying they loved the "bubble" of Disney.
I think there are so many options and reasons behind choosing different options that there is a sense of pressure to validate our choices. But I could never understand why the whole onsite/offsite thing is such a big deal; and it especially humors me when there is an implication that staying offsite is "less" of a Disney vacation than staying onsite. I think just by being in Orlando in the vicinity of the WDW area you are in a Disney "bubble" as there are Disney related signs and memorabilia everywhere, JMHO.

The bedrooms were fine, but the living area was tiny, and the kitchen would not work for us At All. We don't do a lot of cooking on vacation but we always have snacks and stuff, resulting in at least a load of dishes a day, and I wouldn't have wanted to cope with them in that kitchen. Rather, I wouldn't have wanted to cope with the kids griping about it. 
I didn't much like it myself, which was less of a surprise when I considered I've never liked the Caribbean Beach Resort, either, but not expected since I quite like OKW in pictures (except the pool). 
