Not American but I’ve lived in the US for 15 years.

As an outsider:

- closets. I love all the built-in closets. I was never a wardrobe fan.
- separate laundry areas.
- that most housing is detached. On the one hand it does mean a huge reliance on cars. On the other hand I never ever hear my neighbors.
- accessibility of toilets is a heck of a lot better than any other country I have visited. During the day I can usually rely on finding a Target or Starbucks or something. Even if I have to buy something to use it they’re easier to find than in Europe.
- the casual way everyone dresses. My fashion-conscious friend is appalled but especially as a parent I appreciate that I can dash out in my pjs if I really, really need to.
- convenience. Every time I visit my family now I forget that not all shops are open until 9/10 pm. I also live in Washington state currently and have developed a deep love for all the coffee stands around here.