Not particularly, but I guess it happens. Ever since Poland entered the EU in 2004, travel between the countries has increased. But it's more common for Polish people to go to Sweden than the other way around.
I would have to say it is. At the seaside in Poland and in all of the SPAs there's a lot of Swedes, Danes and Norwegians. There are very cheap flights between these countries and Poland is very cheap for people working in Scandinavia.