It's WDW, you have to get used to it. You have to expect that if you are trying to find a 'good seat' (parade, fireworks, forecourt show) then just about everybody else is going to do the same thing. It will get crowded. Nothing you can do about people getting close beside or behind you. If they get in front of you- you weren't close enough to the front to start with.

If there is enough room between you and a curb, rope, or fence for a palmetto bug to crawl, someone will try to fill that space.
Just sayin....