Greetings from Poland and congratulations on your upcoming wedding. I got married in Poland last year, and the difference between a typical American wedding and a classic Polish Catholic wedding can be summed up as follows: in Poland there is less speechifying ("I first met the bride while bowling with Rob..") and much more drinking and dancing, and the weddings last until dawn where as in the US they tended to die down after about 2:00am, if that.
Also, there is a cute custom in some parts of Poland where the wedding party is stopped by local lads who form a blockade in the road, until the best man gets out of the car and "pays the toll" in the form of a bottle of vodka. Hilarity ensues.
Good luck and enjoy!