When we stayed at WL in January 2006, WL had direct bus transportation to the MK and Epcot. I don't recall there being a bus to TTC (probably because there is no specific need for one -- folks who want to ride the monorail and get on at the MK.)
We find it quicker to take the bus; even with a couple extra stops thrown in during non-peak hours (one day we 'toured' the Poly, campground & OKW ); took around 45 min.
My family does insist on returning via the monorail though. Gives them a chance to whine when they see the MK...as in why did we 'waste the day' @ Epcot .