Sure, people in English-speaking countries don’t feel compelled to learn English, unlike most of the rest of the world, but I don’t think they are all in the same boat. I’m not certain about New Zealand, but I know Australia has quite a demanding foreign language component of its educational system, focused mainly on Asian languages. Maybe it’s just hype, but my impression is that Australians who go to university generally have decent competence in at least one language other than English.
Students in the UK who wind up going to university certainly seem to have more foreign language competence than their American counterparts.Canada is probably more like the U.S., but there’s an awful lot of bilingual education there. My raised-in-Toronto nieces spent years of public elementary school in French immersion, and both are competent (and more) in French. My four year-old Canadian grandnephew, who lives in Montreal, is completely bilingual.