Insurers have been known to dig in much more once you make serious claims trying to find something you didn't initially disclose to them so that they can invalidate your policy after the fact.
The bottom line is that the personal health care market is a scary, scary place for a very large number of people, not just people with cancer or heart disease. It's one thing to risk not being able to get coverage, or having your coverage taken away, when it's just you; it's an entirely different deal when you have a family to take care of.
If this reform bill is able to really address that concern, it will make it much easier for a lot of people to transition jobs or start off on their own.
Luckily, the second job pays me enough to get insurance on my own and I still make more than what I did before, but if I had a family to think of that may not have been the case. For someone in that situation, it would likely be easier to make that jump because of the assistance the government can now provide to those who can't afford insurance on their own.
Not to mention, when the exchange opens up in 2014, more small businesses will be able to provide insurance to their employees and those who absolutely can't take a job with insurance will have more options.
Furthermore, with the tax credits small business will get for providing insurance to their employees, it might free up financial resources for business who already provide insurance to their employees, allowing them to expand their workforce.
I keep seeing mixed arguments about the exchange. There doesn't seem to be any conclusive evidence that it is actually going to make health insurance more affordable for small businesses. The only thing that appears to make it more affordable is not the exchange itself, but the subsidies for small businesses that offer health insurance. That's just a cost shift to someone/somewhere else.