Well let's be generous and also include Portugal and Spain for good measure, both of which have seen an entire generation's prospects suffer massive harm due to EU (eurozone) policy. It's always funny to me how blithely the destruction of millions of people's lives and potential is waved away when it doesn't fit the narrative.
And then lets take a look at the North: Germany employs the Euro to support its economy by decreasing the true cost of its exports, resulting in the impoverishment of the southern European countries already mentioned. France's economy has been facing calls for major reform for decades now and - not sure if you've missed it - the latest economy related political problems have led to a minor civil war. Both economies also now face the prospect of integrating millions of low-skilled, penniless new arrivals. Those are the two biggest economies by far in the EU (if UK leaves). And then there's no shortage of other economies snapping at Europe's heels, all perfectly capable of manufacturing products that are equal if not superior to what comes out of Europe. Many think that German automotive engineering dropped off a cliff in terms of quality in the early 2000s and never really recovered, as a consequence of superior quality from Japan and Korea. And now China are just starting to penetrate Western markets with cars that are plenty good enough.
Also don't forget the Euro does not have the privilege of being the world's reserve currency. This gives the US a massive advantage and lessens the impact of deficits.
I live in one of these high benefit economies and having been taxed for years feel I'm owed something in return. But I don't expect it. Given the trends afoot I think anyone below 50 in Europe that thinks the welfare state will continue to be like it is now over their lifetime is utterly delusional.