I end up at Pittsburgh International Airport at least twice a year. This airport has plenty of shops and restaurants beyond the checkpoint and a few on the public side. It has dine in restaurants and grab and go spots. It is well lit, nice moving walkways, clean, and majority of the time friendly. There is a free wi-fi connection which some times doesn't work, but most of the time does.
Watch out for the security check point. Pittsburgh International has one major security check point and when it gets busy it will back up. There is an alternative one that they only recently used, but it also gets backed up and is a bit of a walk to get to. Make sure if you are leaving out of Pittsburgh that you give yourself plenty of time.
The parking is great. Wide, open lots that offer plenty of parking fairly close to the terminal entrance. The baggage claim area is divided in a way that it cuts down on congestion fairly efficiently.