Hey Carolyn, we have flown the Southwest flights, and it works great for me on days I only wish to take 1/2 day of vacation.
We have also flown Delta a couple times in the last few months, and I have no problems with the smaller jets, find it a very, very smooth ride, and I suffer from motion sickness so I am very sensitive to that. And I have been told that they are safer than the larger jets, but I sure couldln't tell you why. What I don't like is having to walk out onto the runway and then climb steps to get into that plane. You do that both at RDU and Orlando. Guess it is because the plane is so small that it doesn't reach up to whatever the thing is called that you normally walk down to board most jets. Each time I have flown the smaller Delta planes, we have arrived early in Orlando, except for the night we were late leaving RDU because high winds kept the flight from leaving its origination point. Being smaller, it takes just a few minutes for all passengers to board and be ready to take off.
All that being said, our trip next month will be on American, going thru Miami and changing planes. Even with this it will still take less time than driving and it was the only thing I could get at a reasonable rate at such a late date.
We have normally driven to Orlando in the past, but those were normally family trips with all 3 of us. Our trips this year have been to see our DS in Orlando and we have had shorter weekday trips necessitating flying. Also, purchasing 2 tickets is easier to swallow than purchasing 3.