Does the race "thin out" at all? I've though about running the first mile and doing intervals after that if it would be easier to do this. I have watched some races on
Youtube and it seems fairly crowded, but it's usually walkers taking the video so I didn't know if I could "get ahead" of the pack and make it easier to do intervals. Thanks for all the feedback in this thread. It's very helpful.
Don't worry - yes, there are congested areas but it really is just a few places.
Having said that - the first mile or so is really congested pretty much from the start down to the ramp from Epcot Center Dr onto World Drive...more so because it's narrow there ("Caution runners, course narrows ahead") is steeply-banked, and VERY dark.
After that turn from Epcot Center Dr onto World Drive, though, it really opens up. There's usually been a picture op near there but plenty of room all the way until the transportation center.
The transportation center is where it gets congested again....and the portion back on World Drive that goes down under the Seven Seas Lagoon and back up in front of the Contemporary is the worst IMO. I've always just had to run whatever pace the crowd runs there. As much fun as running down Main Street is (and it's AMAZING!) it's also pure chaos with people zig-zagging for photogs and to say "Hi" to supporters.
Running through the castle, of course, is congested but, honestly, not too bad - it's quick.
The next area of congestion is Cone Alley (after leaving MK). I don't think it's as bad as the Contemporary/World Drive stretch but can be somewhat of a pain.
One pet peeve is that at the end of Cone Alley, the spectators start squeezing the course looking for their runners. i know they're excited to see their runners but the course gets quite squeezed quite a bit sometimes.
But after that (around the GF) it opens up and there's smooth sailing ahead! Of course, there's some heavier areas like WWoS but nothing as bad as the areas I mentioned (IMO).
TL;DR - congested, yes, but you'll be fine! Have fun!