In my experience living in a couple of countries in Europe, generally the bigger the country the more the nationalism (though Germany is maybe exceptional on this) - small countries have very little tendency for people and business to display the flag and have flag-themed products and objects whilst larger countries have more of that.
That said, the far-right everywhere are flag-shaggers and during periods with large international sports events (for example, the World Cup) many normal people will display a national flag, though even then it's more so I large countries than small ones plus in some countries other flags are used (for example, in Britain they use the flags of the nations rather than the UK flag and in The Netherlands they use the "Oranje" flag rather than the Dutch flag).
I think the only country in Europe with nationalism close to America is the UK and I don't believe it's anywhere the same level (for example, they have nothing like the Pledge Of Alliegance).