It helps in the fact that people with infectious diseases are being treated instead of just spreading it around until their immune system kicks it and then they have to go to the ER or die.
Health insurance != health care. And people who stay away from doctors till they crawl into an ER, probably will end up on Medicaid. Who will actually provide medical care to Medicaid recipients when the payments are well below market rates? I think in the long run it'll be those ERs who can't legally refuse to serve you. That's a rather big hamster wheel.