Monorail, of course. But it is such a pain to get on one from MK! You have to walk that huge hill, and by the time I get up to the platform I'm 50% more exhausted than I was before.
I love love love the Friendship boats! For some reason, they're very relaxing. And the ferry from the TTC, that one is fun too.
The busses hold a very special place in my heart. Yeah they're a hassle sometimes, but when I ride one for the first time of my trip, it's when I know I'm really AT DISNEY. Ya know?