We're already out of pocket about US$1000 this year with basic check ups, lab tests, and one allergy test (more to come) for my SO. That's with one of the best employer provided healthcare benefits I've ever had that has about $400 a month in premiums.
If I need a sleep study or further surgery as already recommended then we are looking at $4-5k for that alone not including followup, medications, supplies, or other appointments.
Without the ACA I might be dead today due to costs and availability like if I was denied insurance based on pre-existing conditions and could not afford medical care I needed over the last 5-8 years plus mental health care. My parents paid about $22k out of pocket for a surgery I needed during that time (and on their insurance).
I'd have about $45-50k in the bank if my healthcare over the past decade was 100% covered. That is about 10x my current retirement savings or could be a down payment on a house. The USA is not representative of first world countries or at least should not be directly compared to them when it comes to health care.