British National here: Making use of the EU's freedom of movement, I lived in Finland but after a 3yr stint back in the UK (London) I now live in Sweden and have for the last 3.5~ years.

I feel like I haven't assimilated as much as I should but! to answer your question: it was/is very valuable, to see how other peoples approach life, to see subtle differences between how people handle things commonly- you pick up life tips that make being human a little easier. Simple things that are obvious in retrospect.

However, I'm not sure what the alternative would have been if I had stayed in London.. Without a frame of reference it's hard to know if it's was /more/ valuable than the alternative.