Don't let it scare you off; there are lots of people but not to the point of anything being chaotic or bothersome. Staff do an excellent job of keeping hallways clear and keeping traffic flowing. As long as you yourself don't frequently stop and stand right in the middle of hallways, you won't see any problems, I'm sure. It's just like the roads, as long as you know how to act on the roads, you'll never get hassled, lol.
But really, the con is amazing, and if you go out with the mindset to have a blast and enjoy it, it'll be good to you. ^_^