Yet average GDP for every EU country except for Luxemburg is still lower than that of the USA.

Certain job sectors in fact across Europe such as IT pay pittance salaries compared to the USA. Sure, you only have private healthcare in the States but it is also of a much higher quality.
Many Europeans need to flock exactly to the States to get experimental cancer treatments simply not available in Europe.

I think you are pretty much the definition of an ignorant European who stupidly have outsourced energy security to a country you for some bizarre historical reason hate and you have also installed countless layers of government thinking it will protect you from trouble where in fact it is turning into a similar political setup that Adolf Hitler wanted to achieve: Germany in control and no one else gets a say. When someone wants to leave said political system such as the UK you shame them and completely forget it was them who saved your asses from all speaking German or Russian by now.

It is also my understanding that the once secure job market in the likes of The Netherlands now with year only contracts is nowhere near as safe as it used to be. Plus the constant mumblings over ditching the mortgage tax break would make the average worker / mortgage payer much poorer if it were to go.