It seems your "worst flight" experience is based going to BWI, however Spirit has many longer flights from the West Coast or close to the east coast like LAX-FLL, LAS-FLL, or even some International Flights from South America to FLL.
My worst flight experience was flying MNL to WNP. It's only a 45-55 minute flight, but with the high winds aloft and only being serviced by turbo props (up to 3 different airlines), it is not something I look forward to when I visit my son as WNP is the closest airport to where he lives. I still have close to an hour drive from the airport to his house.