Cruised in December and we took Disney Transportation and would not do it again.
You do travel on their schedule. They tell you when they will pick you up and when you get to port.
We had a large family group (12) and as soon as we got on the ship everyone headed off to make reservations and found that EVERYTHING was all booked up.
No Palos -- I got the just about the last dinner reservation, others in our party were shut out, no brunch, no high tea.
No Tea with Wendy -- We had 5 girls ages 3 to 7 and Tea with Wendy gone.
Almost all Spa Treatements gone -- Those in our party who were interested had slim pickings of a few leftover appointments.
It doesn't seem right that you stay with Disney at the resort, trust Disney to transport you to the boat and then get shut out of everything.
If you have any interest in doing anything that requires a reservation, do not take Disney Transport.