The X is not confusing.
Once you exit the plane, proceed to the tram that will take you to baggage claim or the exit.
When leaving PIT, check in, board the tram, and go to either area A, B, C, D. The letters represent a section of the terminal, a section of the X.
Once you get the hang of it, this is a simple airport. Easy to navigate and with lots of eatery options. If you want a decent meal, head to the Hyatt...just be prepared to walk.
Yes...the terrible towels were everywhere during the 2009 Superbowl season. Festive Airport for sure.
For your reference: http://en.wikipedia.org/wiki/Terrible_Towel