The only reason I've travelled via PIT was the fact that ERI and BUF were more expensive. I don't mind the 2hr drive from Erie and getting to the airport is easy.
I went thru PIT during spring break season and knew the queue for TSA screening would be long...YAY for Pre-Check! Got in and out of security in about 5 minutes. There were plenty of agents working and getting passengers on their way efficiently.
PIT is a bit dated and could use a little revamping in the terminals. Sad to have seen US Airways (pre-American takeover) leave and move major hub activity to PHL; I'm sure at one point it was a really bustling airport. It would be great if the airlines offered more non-stop cities to middle America and the west coast.
All in all, choosing PIT as my destination airport was a good experience and I'd do it again.