We flew SW this past September and they were particiapting- just not for the return trip. We checked our luggage on the way down, but took care of our own for the return trip. It really was not a big deal though. We just put our own luggage on the ME bus (with assistanc from the driver), unloaded it at MCO (with assisatance from the driver) and wheeled it in to check it (with assitance from a skycap).
It would have been nice not to have to handle it from the resort until we got home, but it wasn't hassle enough for me to not use ME altogether or try a different airline.