Tried to post this last night but the site went a bit funny so apologies if this posting pops up again (or words to the same effect).
My "personal integration point" came in Belgium having had a child. Up to then, I had been living in an expat bubble. Now I've got roots!! This has also been helped by the overwhelming warmth of attitude that Belgians have towards children. Also, there's something about learning how another culture raises their children that gives you a much deeper understanding of a country and its people that one would normally experience.
Perhaps Brussels is a bit of a strange example because there are so many expats of different nationalities here: on my street alone their are Finnish, Swedish, French, Spanish, Danish, American, Indian and Belgian families. So one is bound to socialise with other foreigners. In addition, Belgian family life is still quite traditional and the downside of that can be that some don't socialise after work and go home to socialise with their own families/in their own villages at weekends. (Belgian friends have told me that they are initially reluctant to make friends with expats for the pragmatic reason that they tend to leave after two or three years.)
However, since having a child and settling down and buying a house here things could not be more different. DD is integrating at a local school and so are we! The other mothers could not have been friendlier, especially when we make an effort to speak both the local languages and they learn we are settled here for the forseeable future.
Just this morning, taking dd to school, I chatted with the postman, had a gossip with two of our neighbours, gossiped with the concierge lady in the apartments at the end of our road, waved at a colleague from across the street - it was like being on the set of Neighbours (minus the sunshine and fake tan).
Yes, there's too much bureaucracy, it's grey and cold, there's too much litter and dog sh*t on the pavement and customer service in shops can be lacking to put it mildly ...but there are good and bad sides to every country and in the end it comes down to what you make of it. For me, the pros of living here far outweigh the cons. I'll always be a bit of an outsider but it is now "home". The only weird thing now is going back to the UK. I feel like an outsider there too!!!