Not so, yellowfish...we moved from CBBR to RPR and they moved our bags for us. We left them with bell services at CBBR and then checked in with bell services at RPR when we got there. It did take some prodding to get our bags back, but that was just a service lapse, not a service plan. ;-) I have heard that the deluxes won't move you to CBBR, so it may not work in the other direction--but it worked for us moving TO the deluxe.
We did three nights in a family suite at CBBR and then moved to RPR for one night. The only reason we moved was to get the express passes, so with four nights onsite we had two days of express passes and four days of early entry. We were travelling with two adults and three kids. I actually didn't like RPR nearly as much as I liked CBBR. The CBBR Lazy River was awesome, and the theming is so much fun. But we did enjoy the express passes that only come with a deluxe. YMMV.