If you watch Wishes from somewhere near the train station, you should be able to exit MK fairly easily. I'm going to throw out a 3rd transportation option and suggest that you take an Epcot resort bus instead (just keep to the left when you exit MK and walk towards the Contemporary, the bus queue is right there). I was just there, but for the life of me I can't remember how they were arranged, but I would go first choice with the Beach Club/Yacht Club bus. When you get off, you are literally a 5-7 minute walk to the back entrance (Int'l gateway) of Epcot. Honestly, I would think that after watching Wishes, you could be over to Epcot by 8:00ish. There are some great spots to watch Illuminations in this area. After it's over, exit back through the Int'l gateway and enjoy a nice dinner somewhere on the Boardwalk, or drinks in one of the clubs. You can even go back to the resort and hop on a bus to Downtown Disney. Just you and hubby, and the night is still young.
Noticed that your from Mass also. Looks like you have perfect timing and should be exiting the state before the snow arrives.
Tammi