I have used Southwest Airlines on several recent vacations. The most recent was in August 2007. We flew from Buffalo, NY to Orlando International Airport. The gate staff at both airports was friendly and knowledgeable. One of the gate staff actually carried our stroller down to the aircraft for us.
The flight crew was very helpful during the flight. My wife and I were travelling with our three children and had our hands full. They would bring them crayons and other distractions as well as talk to them in order to help keep them satisfied.
The flight attendants make the atmosphere on the jet very light. They are very relaxed and even make an occasional joke over the intercom. It seems like the employees really enjoy working for Southwest.