The boats at WL only go to a few locations. FW, CR and MK.
You can catch an EC bus at the resort or go to TTC and catch the EC monorail.
To get to EC from MK you will have to take the monorail to TTC and switch monorails.
EC is about 4 miles from WL and there are no waterways connceting the two.
The YC/BC, Swan & Dolphin and BW resorts do have boat launches to EC and MGM.