I re-booked with the Orbitz deal today. Didn't take any time at all. I booked it online, paid for it and then called Disney to cancel my ressie with them. To answer some questions I have seen in previous posts:
No, your ADR's will remain even when you cancel the WDW reservation. I specifically asked prior to cancelling with Disney. They have to be cancelled seperately so no worries there.
With Orbitz, you can book it as room only or add your tickets on.
Orbitz cxl policy is: I am arriving 5/13...fully refundable until 5/8. beyond 5/8 thru 11:59 pm 5/12, $244 cxl fee (most likely based on my resort rate). Any cxl on day of arrival from midnight is fully non-refundable.
No, I am not earning Disney reward dollars but I used my Discover card, went through the Orbitz link on my Discover account and will earn 5% cash back since I have a cash back card.
I decided to do room only with Orbitz, although adding my tickets on was still a nice savings for me. I checked Undercover Tourist (who I have gotten tickets from before) and can save an additional $24 over the Orbitz ticket price.
I did not see any option to add the DP on to the Orbitz booking so if you are doing DP, it may not work for you.
All in all, I have saved $185 and the only time it took was less than 10 minutes for the whole re-booking and then cxl with Disney. I don't know when my reservation will fall into the Disney system so I will most likely give Orbitz a call this week to see when that will happen.