We always stay off site. When we hop, we almost always take the car with us. Two exceptions:
1. MK to Epcot or vice versa. The monorail is fun for us
2. HS to Epcot or vice versa - sometimes. If we have time to kill and it's not incredibly hot outside, the boat is a nice trip. Don't ride it midday during the summer. It's hot as heck on a crowded boat.