It is certainly not something the majority do but I do think it goes a bit beyond the privileged few and it is certainly not always about privilege. Mate from school works as translator for Bank of Spain, my own third sprog studied and worked in France, my son is currently working in Spain, my neighbour's son is currently working in Amsterdam; all just kids who went to local comps and took advantage to go out and make their mark off our shores. I was chatting yesterday to a couple moving to France for a year or two. There are already large numbers living and working in France and Spain I think.
Admittedly that is anecdotal but I think it is a clear benefit of EU and I would prefer to see efforts made to increase the numbers of people from places such as Liverpool and Sunderland doing this rather than it be just for the minority. The EU would be a great vehicle for young citizen volunteer exchange programmes which would really help social mobility. A more generalised version of the Erasmus programme maybe.
The big wheel comment is because I think Britain, in normal circumstances, can offer a great deal to the rest of the world in terms of academia, industry, commerce, technology and the arts etc. and as a very wealthy and developed economy it should do so. Not being the policeman as such, that era has passed; but playing its part as being a force for good in the world, using its standing in its nearest large organisation as a springboard first.
And because I think economically membership of the EU is beneficial overall that is our best bet for improving the lot of our own citizens and doing well on the wider international stage.