I have talked to several people who have been to Warsaw and Krakow - All said they would go back and stay longer - in a heartbeat. (I had the same experience in St Petersburg, Russia)
Never been overseas, but the pics I've seen on the net are cool--it's really nice out there.
I wouldn't mind going to Poland someday ;)
And the past couple years, my dad's company has had college students from Poland working here. So, I've even picked up a few Polish words myself ;)