We took the monorail to the Magic Kingdom, Epcot and the transportation center, we walked to the Grand Floridian and the transportation center, we took the ferry from our resort across the Seven Seas Lagoon to the Magic Kingdom and we took the buses to and from Hollywood Studios, Animal Kingdom and Blizzard Beach.
Disney's Magical Express: If you stay at an on-property resort, then you can get free transportation from the airport to your resort. In addition, they took care of picking up our luggage and delivering it to our room and taking our checked luggage back to the airport and checking it for us. This was an awesome perk and it worked perfectly.
Monorail: The monorail was fun and generally convenient for us to use. The best thing about it is that I didn't need to fold up the stroller in order for us to take it. My biggest gripe was that after a long day at the Magic Kingdom we were always stuck waiting in line for the monorail. This wouldn't be so bad if they actually made an effort to fill the monorails up with people, but more often than not, the end trains of the monorail were barely used forcing everyone waiting to have to wait longer. no big deal, right? I'm just glad that we weren't visiting during the summer, or a time when the parks are truly busy as it just would have been worse.
Ferry: We loved taking the ferry to the park from our resort. We never had to wait too long and it was a fun change. We never took the ferry home from the park, mainly because by that time of the night we had tired girls that I didn't want to pull out of the stroller in order to fold it up.
Disney Buses: I was very disappointed with the Disney bus system. We often waited 20+ minutes for our bus (once waiting nearly 40 minutes) and the buses were almost always crowded, with standing room only and they would take circuitous routes to our destinations to stop at other resorts or parks. After our day at Hollywood Studios we had to wait in a big line for 3 buses before there was space for us and then the ride home took a long time due to an accident in the middle of the exit road from Hollywood Studios.
Overall, I give 2.5 out of 5 stars