When we were there a couple of weeks ago, we had been in NOS and decided to head back. CMs routed us through a back way behind Main Street once the parade started. I think we went to the back area around Carnation Cafe and came out at the Fire Station. We'd been planning to leave, but saw a spot near City Hall that was marked off for parade viewing and completely unoccupied and hung out there. We'd seen the parade and fireworks the day before, so we really just wanted to see the floats again and didn't care about the dancers. It was a great spot, and I think most of the spots around the hub (or down by IASW) might be less crowded that way.
As far as moving around: we didn't have any problems, except that the hub was kinda busy. We hung out in Toon Town until about 10 minutes before it closed and then moved from there through the hub to Frontierland/NLO/Critter Country. I actually didn't have too many problems our first night either. It was a slow slog down Main Street to the photo place after fireworks, but after I finally got out of there, near the beginning of the second parade, I was able to cross the street, go to Adventureland, and eventually make it back up Main Street as the parade was going on. It wasn't horrible.