Depending on how long you have to wait for a boat, the ride over to MK can be about 10 minutes or so. It also depends if they are stopping at WL first, or go to FW and then stop at the Lodge.
When we stayed at FW we would take the boat to either MK or COntemporary (whichever arrived first) and then monorail to EPCOT. We never bussed to EPCOT, because we enjoy the boats so much.