Actually you are quite wrong.
Southwest pays quite well, and now excedes most of the other majors in class and craft. There 737 pilots do a lot better than AA's 737 pilots and its only going to get worse for the AA pilots as the drums beat for concessions around the industry.
No it is not true that pilots are called into move baggage, they do sometimes help cross the seatbelts if they have time inorder to board the aircraft quicker. Pilots moving baggage would bring on very expensive disabilty and sick claims for back injuries. That's one of those myths that doesn't make economic sense.
What southwest pilots do is FLY. ALOT, which is all any airline pilot ever wants to do. It is very common for a UAL NWA AA DAL pilot to fly 1 hour to the hub, sit for 3 hours fly an hour out sit for an hour fly another hour sit for 4 hours fly an hour and go to the hotel. That is the major's idea of "efficient" A southwest pilot day is fly an hour, 20 minute turn fly an hour 20 min turn fly an hour 20 min turn fly an hour 20 min turn, till they have flow 6 or 7 hours in a 10 hour period, as opposed the the AA pilot flying 5 hours or less in a 14 hour period. The DAL/AA/NWA pilot goes to work for 14 hours and gets 5 hours of pay (this is on duty time, not including hotels and whatnot) and the Southwest pilot goes to work for 10 hours and gets 7 hours of pay (at an hourly rate that is now equal to the AA/NWA etc pilot.)
That is not the fault of the pilot. That is the fault of the managment of the airline. When you use your resources so inefficently you could fly the airplanes for free and lose money.
That is how you use your resouces efficiently. Using a 100 dollar per hour pilot to load bags is not an efficient use of resources no matter how nice it sounds. He should be FLYING, which is what southwest has them do.
Cheers
Wino