Eastern Europeans don't go to these places because they actually have always dreamed about moving.. They go there because they need the money to support their family. I don't know how rich/poor Holland is, but I bet it's richer (or used to be) than any of the countries of the eastern europeans that move there...
These people are desperate for money, I mean it's not like they are business men traveling around the world, they're actually (usually) pretty poor people, at least if you compare to west europe. I'm sure they're not too thrilled about being there either.
They showed on the news last year some Polish people who were working here ilegally. They came here because they had a difficult life in Poland and could hardly pay for their food (LOL I'm making Poles seem like some poor-ass people, sorry). So they came here to build things, and got a very lousy paycheck. They had very long days (12-18 hours) and they lived in an abandoned train.