What a bummer! I just read about the mandatory disembarkation for B2B'ers
We did a B2B in Feb and really enjoyed our "special day". There were 14 doing B2B that Sat and only the Internationals had to do anything special (I think they had to report somewhere with their passports). There were only 2 of us, in our group, and we gave them our passports the night before (down at guest services).
We ordered breakfast supplies (cereal,milk,fruit) the night before from room service so then we slept in Sat morning - got up about 10. Ate in our room/got ready. Started laundry and went through all the big suites!! Every nook and crany of the 2 Royal Suites (Walt Disney Suite and Roy Disney Suite), the 2 2-bedroom suites, and even a 1 bedroom suite -- all up on Deck 8.
Housekeeping was very gracious. We kept asking "are we in your way" to which they'd reply "no, it's the perfect chance for you to see when no one's here and all the doors are open". I took lots of pictures and when one of the managers came through she asked if we'd like to be in some -- so she took our photos in the different rooms. She said guests often have an eye for something out-of-place or undone so to let her know if anything wasn't "just right" before they were done. Needless to say, everything was just right.
Apparently, most people staying in the Royal or 2-bedroom suites have things "shipped" to the rooms and buy the decorations/welcome treat-trays. One of the Royal suites had 3 big cardboard shipping boxes delivered to it while we were there. There were "Happy Birthday" decorations pre-ordered and already up and the room attendant commented she bet the boxes were full of presents -- she'd seen that before. If I could ever stay in one of the Royal Suites - THAT would be my present! The attendant said they usually keep the boxes down below as the party often requests items, presumably the same gifts that they've mailed to the ship, to be mailed home.
I've rambled - it was very fun and a special highlight of doing a B2B.