First post, just decided to do some math out on this:
I've heard 8-10 people gondolas so I'll use 9 guests per gondola.
Approximate departure rate 30 seconds, gives us 18 guests/min or 1080 guests per hour (1 bus every 8 mins to each resort)
Looking at the resorts* serviced by room size:
Caribbean Beach Resort: 2112
Art of Animation: 1984
Pop Century: 2880
Total:6976 rooms
Assuming 90% occupancy (I've heard the number before) and 3 guests per room on average: 18835 guests in these three resorts. Now lets say 1/4** of those guests go to either DHS or EPCOT for the day gives us 4709 guests visiting either a park per day. If 1/4 of those stay for a night time show (ROE or F!) and leave immediately after... 2354 guests will be trying to get on the gondola system at one of the parks at one time. This will take 1 hours and 6 minutes to get the last guest on board.
*This does not include people that might take the gondolas from DHS instead of friendship boats from Beach club (865 rooms), Boardwalk Inn (910 rooms), Yacht club (630 rooms), Swan (758 rooms), and Dolphin (1509). Also does not include the new Riviera Resort.
**This is a low estimate because it assumes only 1/4 of guests will go to a park on a given day (many resort guests follow EMH).