The park is NEVER insane when they tape for the parade. The park is never at capacity when they film. It may seem like it with all the action on Main Street, but once you’re past Main Street, the park is VERY easy to get around and very slow.
The first 2 weeks of December are generally “dead” when it comes to guests in the park. And many of the guests who show up for the filming are completely unaware they are filming. They just showed up to the park on a day they filmed.
Filmings are fun but can be tedious. Anyone who shows up in the park can be part of the action. Only specifiic guests get signaled out for one-on-one questions from Ryan Seacrest and the like, and that too can be strictly random.
If don’t want to be part of the crowds, then just take the routes they have to allow guests to bypass and go play in the park. Hope I’ve been helpful.