Kimmiep- I like the plan! It's about pushing yourself and having fun :)
Have you run WDW before? Based on when I ran it in 2009 and 2010, the beginning couple of miles are a real mess of people. Things don't really clear up until you leave the Epcot area and get on the 6 lane road heading to MK (World Drive). It's real easy to waste a lot of energy trying to navigate the masses during those first couple miles (I know...I've made that mistake).
I'm not going to worry about running the first couple of miles just because of the traffic jam. Once I hit World Drive is when I'll start worrying about time and consecutive running.
Hope my unsolicited advice helps ;)
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