I've only ever flown Southwest (nashville to orlando). We use our reward points on the SW credit card to fly and that has been super convenient. We have had great experiences with SW except for October 2021 when a bunch of flights were cancelled and we ended up having to book a rental car and drive home.
I'm hopeful that this meltdown will create change/updates at SW. They are going to have to pay out so much money to reimburse people and will also lose money from people who will not fly with them anymore so hopefully that will force/encourage them to make the necessary changes.
Since all this has happened, I looked at United, Delta, and American to see if any of them offered direct flights from BNA to MCO and I didn't see where any of them do. Therefore, our usual 1.5 hr trip would end up being 4-5 hrs with one of those other carriers.
So I'm sticking with SW for now.