So it seems that the European Union countries are the least intrusive as far as customs and immigration goes. I'll add Singapore to that list of countries.
Originally Posted by huts
On the original topic, Australia is one country that will definitely ask questions when a citizen reenters the country, although I probably get more of this because I don't actually live there these days. My wife is a US citizen, and previously when we lived in a country that was neither the US or Australia, she would get more questions entering the US than I would, and I would get more questions entering Australia than she would.
A few years ago, my partner entered a country which she had just become a newly-minted citizen of but had never lived in. Given her experience as a native-born Canadian reentering Canada, she was terrified of being questioned in a language she isn't fluent in. All the immigration officer did was briefly glance at her passport and politely thanked her.