I fly South West and the departure gate is usually in the old part, near Margaritaville.
So yes, the Club Mo Bay departure lounge is quite a distance from that.
I use arrival service when I go around the Holidays because the airport is very busy. I also appreciate having a nice clean and roomy place to change out of my winter clothes, since I fly from Chicago. It does save considerable time waiting in lines to clear Immigration and then customs.
In fact, last winter, the lines in Customs were very long in the afternoon, and I heard some very angry remarks about me cutting ahead so I clarified that I paid for the fast track service, and it was an option for them in the future.
Then I wrote to Club Mo Bay to point out what happened. There weren't enough staff working customs, and the dedicated fast track line wasn't open. Nobody wants to listen to other angry passengers when you're not doing anything wrong. If I was waiting in that line and didn't realize it was a paid service, I would have felt impatient too.