demographics and "long tail analysis" would tell a different story. It was your eyes that counted one population, at McDonalds. There is no direct, countable evidence to your eyes, how many meals were eaten by what people and how often, at the hundreds of food places nearby.
I didn't say all European travelers eat at McDonalds. I'm sure many, many travelers are far more adventurous and eat like Anthony Bourdain.
But I still find it remarkable that McDonalds strikes such a chord with people, particularly people like my Swiss friend who is as cultured and sophisticated as they come. If we were choosing a film, he'd want to see the most difficult, obscure documentary. But choosing lunch - there's just something about the fear of a bad culinary experience that trumps all other concerns.