I've stayed at POP almost 2 weeks in January, one week in March, and 5 days in May (now in May I didn't go to the parks much). All of that was this year. And in all of this time, I was only on one bus that went to AoA to help alleviate heavy lines over there. I think we were going to MK (or maybe Epcot) but either way there were less than 6 of us on the bus. Maybe only 3?? So the driver was dispatched over to AoA to help with their backup. Even after we 'filled up', there were still people left in the queue at AoA! The lines were that bad over there. And it was a mid morning run. But I would say it is the RARE exception that they share! Definitely not the norm... So basically, for all intents and purposes I would say in general, No, they don't share. But there may be the RARE exception that they will share. But it is rare. I wouldn't sweat it. HTH!