Darty,
I think you will find that you made a great change! I always fly AirTran out of Flint! That is a much smaller, less congested, and easy to navigate airport. It also costs a whole lot less to park your car there. I think you can park for a week in the economy lot for between $25-$40 bucks. Detroit is a whole lot more than that.
AirTran itself is a nice airline to fly with and you shouldn't have any problems.