I just finished my Orbitz details yesterday....

seems like a simple,streamlined Disney deal to me! (kind of reminds of couponing, you can either pay disney price, or do a little legwork and get it cheaper if you want to) Anyway, booked Disney at the sale price, then Orbitz at 15% off, then rebooked Orbitz at 20% off....

THEN when I had my final rates booked, I canceled my Disney res that was already linked thru
MDE-(I waited to avoid all the long hold times last week) THEN I linked my Orbitz res to our MDE....Seamless!

We already had some tickets and dining linked, nothing was altered.

So we saved bunch of cash(more snacks!) and got the exact same deal as before.
...also.... Orbitz has a very easy/fast cancel feature, so that part was also easy,and the charge was refunded FAST.