I was a PJ last year, my senior year, at The Ohio State University. I loved it. Although there is really no PJ program to speak of at OSU, it is in Columbus and we have the largest athletic department in the country, so we had an overwhelming need for photographers. I met many neat people and learned many cool things along the way. I have no interest in becoming a PJ, but there were definitely many good experienced.
Perhaps the greatest attribute is requiring to think quickly, because you'll be in many different, difficult shooting situations (and with me, I don't have the budget to afford new pro level cameras and lenses, although I could use a 7-2 2.8). Oh yeah, and the whole "you must boost your ISO because you aren't in a lab". There were a few times I had to get really creative to get a shot. Sometimes I got out of a comport zone, but that makes for a better all-around photographer.