American workers barely get any vacation and they probably don't want to burn what little they have on flight time. Mexico is a very popular and that's a different culture and language.
1. https://en.wikipedia.org/wiki/Disposable_household_and_per_c...
2. https://en.wikipedia.org/wiki/List_of_countries_by_average_a...
Flat numerical values alone don't tell the full story. It's like assuming Irish are all rich because of their colossal GDP--and not considering that it's due to companies shuffling money around.
Typical Americans really are wealthier than typical people in other developed countries. As you said, they own cars (which tend to be bigger and more expensive than typical cars elsewhere). They also tend to have bigger houses with more amenities (air conditioning, dishwasher, clothes washer/dryer, kitchen island, etc). Some may consider these uses of wealth to be gauche or indicative of something unhealthy about American way of life, but that doesn't change the fact that they are uses of wealth.
You can take a taxi and eat at restaurants daily absolutely anywhere in Asia with a fraction of the median US salary. The cost of many things is simply higher in the US. You can get paid $20 an hour, but if a basic sandwich costs $15, you're not saving as much as someone who gets paid $10 and can buy $2 sandwiches. But on paper, the person making $20/hour has tremendously higher disposable income.
In August people will be traveling to me, as I’m getting married. We’re not yet sure where we’ll go honeymooning.