We went to MVMCP a few days ago. We entered the park around 4:30pm with the intention of using our park hoppers, but they told us to use our MVMCP tickets and put wristbands on us. Around 6pm, they sent everyone towards Tomorrowland, then around 6:45pm, people started going all over the park.
Just a tip, we wanted to see the Mickey's 'twas the night before christmas show (its in tomorrowland) and decided to go to the first one at 7:15...well, they actually had a show at 6:15 that wasn't listed in the guide. Seeing it early would've saved us more time for rides.