Yikes! Get thee to an insurance comany, man! It is very, very, easy to run up a bill of $12,000.
But Vagabond has a good point, as long as it isn't taken too far. Most people would indeed be better off putting aside their own money, and using it, instead of paying for insurance and using that. A wise choice would be to set aside money for normal things like doctor visits, and for small problems that would only cost a few thousand dollars, and then carry a much cheaper policy for catastrophic coverage.
I don't have any car insurance for exactly that reason. I set aside a few bucks per month, until I had enough to buy a new car if I needed one, and dropped my insurance. Saved a bundle.
On the other hand, Vagabond also illustrates a problem with bankruptcy. Assume he follows his own advice, and is then in a car crash where his medical bills hit $100,000. What will happen? He'll declare bankruptcy. And it will be said that his case was "caused by medical bills." Technically, that will be true. But is it really true?