We went last year. I did fleetingly think about taking the 7D, then quickly decided against it.
I took my Panasonic TZ8, and also bought a Panasonic DMC-FT20 to take too (with it being waterproof).
I used both cameras. Mostly the FT20 tbh because it was that little bit smaller (yes, theyre both compact P&S's
![Wink ;) ;)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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I wore cargo type shorts every day so it was great having a small camera in a leg pocket, waterproof too, so I didn't have to worry about water rides etc.
I had absolutely zero regrets about not taking the 7D, I would have hated it. Sure I would have liked to have done some photography while there, maybe of the fireworks etc (Wishes was just amazing), but I'm more glad I spent the time with my family and like said above, not through a viewfinder.
Aside from the comfortability issues (especially in August), you're likely to miss most of the magic of Disney if you're too wrapped up in getting the perfect shot.
Think about what you want to use the photos for. Do you want actual artistically good, photographer style photos? (Ie, like of the animals), or do you just want a record of the trip to remember. Are you going to get them printed, blown up and framed like you would a Wildlife photographer would?
Also, we got Disney Photopass Plus. It was $140, and it lasted the two weeks we were there in all parks.
At your first park you go in, get a plastic card which hangs on a lanyard around your neck, and all throughout the parks are Disney photographers taking staged shots infront of alot of landmarks (The castle etc). You just rock up, smile, let them do their thing and they just scan the barcode around your neck.
At the end of the holiday you log in and order the free CD of full-res shots to be posted. All included.
Oh and all ride photos are included too, so you don't need to buy any of those. Just queue up at the end of the ride as if you were buying, scan your card and walk away. (Although printed photos arent included).
Well worth the money IMO.