Yep, that was us too. Our party was originally Labor Day and we moved it to the Friday before because of Dorian. I didn't have any major concerns about it being super crowded when we originally planned for Labor Day. We tend to have a more relaxed touring strategy anyway.
I feel like a lot of people want to book the party with the expectation that it won't be crowded at all, and then get very upset when rides are not walk ons, there are crowds and you might have to stake out a spot for parade, fireworks and shows. There were a lot of posts last year about how much people hated the party, how crowded it was, etc. Expect it's going to be crowded and go with the attitude that it will be fun anyway. The days of sparsely attended parties are long gone, along with slow times of the year at WDW. BUT.... it is doable and you can have a lot of fun!