During MVMCP we never saw any of the Princesses out and about. We didn't get in line to see them at Toontown so I don't know which ones were in there, but the lines were very long so I know there were some in that room. We found Aurora in Epcot, in the back of the France pavillion. She was there with Beauty and the Beast.
During MVMCP--we arrived at 4 pm and were let in immediately. We did rides and shows until everyone was ushered into Tomorrowland. All other areas were being closed off with cast members directing the traffic flow. When we got to Tomorrowland at 6pm we got in lines to ride some of those rides. All CM's were checking for wristbands before letting us ride the open rides. That way they knew if you were "allowed" to be on the rides. If you didn't have a wristband you had to get out of line and exit the park. It was really quite organzied and efficient.
Enjoy your trip!