I found the transportation to anything but the MK to be a pain in the butt. The busses were shared with Ft Wildreness and it seemed to take forever to get to our destination. We finally began taking the monorail to/from Epcot and then the bus from the TTC and driving just about everywhere else.
No, you can't walk from the TTC since there are no sidewalks.
We had really good luck with transportation service there last week. We often took the first boat that came and if it went to CT we just walked or monorailed to MK. To get to Epcot we sometimes took a boat to CT and caught the monorail and sometimes took a bus. We sometimes shared with the GF or FW but it never took too long. We did have one long wait for a bus home from Epcot one night but everything else was good and most of the time great.