It really depends on where you are in Epcot. World Showcase in a long way from the monorail and would take you a lot longer. Future World is closer to the main exit. If you need to be at the MK and are coming from the WS side of Epcot you can exit at the International Gateway. Take the 5 minute walk to the Beach Club (on your right) and get on the MK bus from there. It would save you a LOT of walking. Also, if you do take the monorail to the TTC you must then go down one ramp and up the other for the MK monorail.