I think one of the biggest differences a visitor from 1950 would notice is food. The Germans were called "Krauts" in the second world war because they ate Saue

I think one of the biggest differences a visitor from 1950 would notice is food. The Germans were called "Krauts" in the second world war because they ate Sauerkraut, a then prevalent way to preserve some food with vitamins for the winter. And today you can go into the store in winter, and buy twenty kinds of fresh fruit from all over the world, and twenty more types of vegetables. You don't have to stockpile for winter, and don't have to change your diet signficantly because fresh stuff is unavailable. We don't think of that as a huge technological advancment, but it has a huge impact on the daily life. Likewise the prevalence of washing machines. The availability of public and private transport in a way unimaginable to somebody from 1950.