I noticed a difference.

I started at my company in late 2017 making $11 an hour at a low-skill warehouse job where a lot of people only stay 6-9 months or so and many put in minimum effort. I worked my way up to a better position where I now make $17.50 two years later. I didn't even do anything that amazing -- I was just reliable, I was never late, and I kept learning new tasks when the management offered, when someone else was out for the day, etc.

I'm not rich, obviously. But I assure you that difference in income is very, very meaningful. Since I was promoted I was able to save about 6 months of living expenses. In the current pandemic it has been a relief to know that I am in much safer shape than a lot of people -- including people whose incomes are higher -- because I keep my expenses very low.

This isn't to say there aren't systemic problems for workers in the US. However, even in an unremarkable job, you can still take steps to improve your situation.