PBI = West Palm Beach International Airport is a great one. Very new, light, airy, and classy. Genuine art adorn the marble and wood panneled complex. Outside the airport approach is complimented with lakes, palm trees, and lush landscaping. Parking could't be easier also. The short term garage is built above the terminal complex so getting from your car to your gate involves a simple elevator ride. It's a shame Trans World is closing their station, but Southwest and JetBlue are moving in.
As for major airports, I agree, ATL is terrific. Modern and easy to understand coupled with a terrific array of food and shopping choices, IMHO make this southeast gateway first-rate. I've never been delayed through ATL thnakfully, but may parents were stranded for like 7 hours a month ago coming back from PWM to FLL.