Denny and GG
In 2006 my wife and I walked to the start of the half from POFQ. We bumped into perhaps 10 other runners from OKW on the way and did it together. We left the lobby of POFQ at 5:15 and were in the corrals with plenty of time to spare for the 6 a.m. start. In fact, since the Disney folks hold the runners in the staging area, we came up the road exactly when the runners were coming over from the staging area.
From OKW go out the front and cross the access road. There is a bridge over the canal just to your right, walk over it. You are now on the 3 lane wide road which angles across the north and east of the EPCOT parking lot, exactly where the marathon starts. Turn right and walk to the start, it is about 1 mile. As you get close to the starting corrals you'll see and hear it all.
I'll be walking to the marathon start again this year. It's the best way to maximize sleep and rest and minimize standing out in the cold before the races.
Craig