I ask because while I may agree in principle with your ideas I would like to stress that it's a bit difficult, on a personal level, to go over considering yourself French, Greek or whatever when your thoughts are framed in a language which is Greek or French or whatever. Take citizens from any two random US states: they still have more in common than people from two different cities in Belgium, just depending on which language is in the majority in the area.
I was born in Bulgaria, currently living in Berlin, doing IT.
I think the culture is indeed different between the member-states, but not so hard to overcome if you are acting together and vote.
They of course have political opinions, watch TV and vote. But they - I suppose - lack the kind of experiences you had in Berlin.
So you either take off their voting rights (UE Commission would not mind at all, I suppose) or you have to accept that USE is not gonna work.
To be honest, I think that Europe (and, by extension, the whole world) will unite one day. With modern communications and transportation people from different countries have far more intense contact than ever before and that will inevitably lead to blending into single community.
The problem is that this process must take some time, and by "some time" I mean "centuries", and EU officials try to speed it up to few decades.
My relative fluency in English is the exception in Italy and in Rostock, too (moved here two years ago so I think I can say something on this matter).
In other words if you think that every citizen in UE has the same command of English (and the same propensity to think globally, assuming I have any and it is related to English) you are wrong.