all airlines do and have participated in Disney's Magical Express (DME). This is the service that, with those yellow luggage tags attached, pick up your bags at MCO, deliver them to your room and bus you to your resort. Anyone with a WDW resort reservation who signs up for DME is entitled to a ride from & back to MCO and the previously mentioned luggage service free of charge. The tips for the service are included already, although I have been know to tip a good driver myself.
What SWA did not, BUT DOES NOW, participate in is Resort Airline Checkin (RAC). This service allows you to drop your luggage off at the resort RAC desk and THEY will transport it to the airport for you. Specifically for SWA, if you are checking yourself in at 24hr, you must still do so and RAC will print your boarding passes for you. If you are using Early Bird Check In, your boarding passes MAY magically appear on your door OR again RAC will print them for you. A tip for the RAC baggage handlers is suggested.
So, with DME and RAC, drop your bags with the yellow tags attached at your home airport. Don't have to think about them again til they appear in your room (and you don't have to be there when they're delivered). On the return trip, drop your bags at the RAC desk (remove the yellow tags) and pick them up at your home airport. Easy, breezy, lemon squeezy!!