Do you need to take off right away? We discovered the Boardwalk area a few years ago and now work that into our Epcot plans. Instead of slipping out early, or being in that sea of humanity heading for the monorail, we simply slip out the back through the International Gateway. Sometimes there is a small crowd waiting at the boat launch, so we opt for the few minute walk over the bridge to the Boardwalk. It's a great spot for a casual late night drink, a little shopping or even an ice cream. Sometimes they have entertainment going on outside as well.
If you're driving, there is a visitor parking lot across the street, or you can pay $6 for valet at the Boardwalk resort and have your car brought to you when you're ready to leave. Otherwise, you can take a Disney bus to Downtown Disney and then your resort bus home from there. I'm sure you could also get a taxi.
Just another option.