For those interested here is a map from OKW to the Start...
http://www.mapmyrun.com/routes/fullscreen/65341608/
My observations (some repeated)
Disney has turned a blind eye to the fact that folks do walk from certain resorts to the start. However, for the first time, the 2013 race program issued a warning against doing this. I am not sure that Disney would/could ever enforce a do not walk policy, but be forewarned that the mouse is aware and is looking. I guess I should also say that in 03 or 04 I heard that folks were turned back for a while at the canal crossing.
If one needs to check a bag or has a retreat pass, I would suggest taking the bus from OKW or come on the monorail. One can work their way back to the staging area but if you are coming across after runners are released to the corrals you are going to burn lots of energy trying to swim upstream. You could leave with enough time to get to the staging area prior to the releasing of the masses, but that seems to defeat the purpose of walking.
One still must take a bus back home to the OKW resort. The gate to the path one would walk back from the finish area to OKW is gated.
If one walks to the start, you need to have your bib ready to show at the canal. Only runners will be allowed to pass. Also note that there is a small construction project on Vacation Club Way that makes walking the road dangerous at best. It is in the area of the cast member entrance that I direct you through and is on both sides of the road. I will keep an eye on the project
it seems to be something that connects the POR and OKW resort services (i.e. laundry)
If you do walk, please use caution and walk against traffic. The intersection you will be crossing is also a local runner kiss and drop spot as well as a cast member bypass. There will be some traffic from folks who do not regularly drive through that area.
Other resorts?...
Yes, POR is also a walkable resort to the start. I would use a cast member back road rather than walking along Bonnet Creek for the traffic reasons listed. I have a map if interested
though the construction project listed above may make this off road path impassable.
Boardwalk, BC, Swan, Dolphin, YC?? NO. Again, NO one cannot walk to the start. The I-Gate is not opened for runner access through Epcot. One must take the bus from these resorts. One may decide to walk from the finish to the resorts but remember that you must also use a pass to do this.
Hope this helps