It may sound stupid because I'm not even European, but it sure has made my life easier. Easier travelling, comparable prices, GSM roaming
charges going down, meeting Erasmus students, the lack of barriers for my fiancée to join me in Brussels and lower inter-bank fees are some of the little and not so little nice details in which the EU has influenced my life.
I hope it doesn't upset the Finns when I say that one of the reasons that I chose Finland instead of, say, Sweden when I was thinking about studying abroad was that it had already been decided then that it would use the €uro.
Pity very few in Europe actually care.