It's been a long time since I've been to this airport. The last time I went through it I just remember spending several hours (due to weather) being delayed. I made many a lap from C Concourse, through the central area, and down Concourse A on the moving walkways. Unfortunately a lot of the shops were closed due to the late hour, but I had my music and I was in my own little bubble.
Had to fly to Charlotte for a business trip on the Monday after Thanksgiving. Jacksonville wasn't super busy when I left, but Charlotte Douglas more than made up for that. The agents - though they take their job very seriously - are all pleasant to deal with and no one was unnecessarily rude.
US Airways isn't usually on my list of options to consider because I fly west more often than north, but I'll have to keep them in mind next time. Wouldn't mind - with the right amount of time - having a layover in Charlotte.