Yes! Find a snack, a shop, a bench, anywhere and just wait. Even 30 minutes will make a huge difference.
However . . . I found this not to work so well on a 2-parade evening in MK. August last year we were in the hub at the MSEP FP area. Waited on rain delay, watched parade #1, watched castle show and then Wishes. We tried to just stand to the side and wait before leaving, but the hub is a difficult place to do this since it is a crossroads. As we waited I realized that most people were hunkering down for parade #2. It made waiting and navigating a bit more challenging. On a night with 2 parades I would try to watch fireworks from Town Square in the future. In fact, Town Square is a great place anytime you want to duck out ahead of crowds or have options for stepping out of the chaos.