It's not the access really. More the worry about paying for it. In the US it can cost a lot, and while your employer covers it usually, this means you're really tied to your job. Here in Spain I never have to worry about paying for it.

I'm sure the healthcare in the US is world-class considering how much it costs. But that cost is the biggest problem for me.

But really, I'm a socialist and considering that this is a swearword in the US for many people, I just don't want to ever live there. My world view is just too different. I've never even visited.