Disney really tries to discourage bike riding except for surrey bikes that they rent. On most Disney roads, there are no sidewalks, and the bus traffic would make it dangerous to ride bikes in the road.
Except for Fort Wilderness, where I think people bring bikes so they don't walk as far at the campground, I don't think Disney really wants you riding your bike.
Also, roller blading is illegal in Florida roadways and parking lots, believe it or not. We found that out when we brought our blades to Coronado Springs.
I would leave your bikes at home.