The main thing is knowing that if you need any procedures, services, an ambulance, critical or emergency care, etc, you'll not be asked up front to pay for it, you'll just be treated. Seeing that principle erode over time is heartbreaking and terrifying.
(rant) Healthcare as an industry doesn't function properly under a capitalist model, which expects that competition and consumer choice will encourage innovation and further competition, leading to a better outcome for the consumer. If you need healthcare, you don't really have a choice in it, or your choices are artificially restricted by circumstance, so you can't benefit from a competitive marketplace. It's a broken system, as far as I am concerned.