So I believe that the official position of Disney and at the WL is that you can't walk to the Ticket and Transportation Center or the Magic Kingdom. Looking at Google Earth, it does look like it would be possible; both are showing about a mile walk via World Drive.
Understood that probably the last thing you want to do is add another mile of walking to your day; I'm just curious if anyone has ever done it?
And am I the only one who looks at WDW via Google Earth? ;-)