Basically, instead of having a private company bureaucrat (who is paid to improve profit) deciding whether you should get a particular treatment or not, you will now have a government bureaucrat making that decision.
Since EVERYONE seems to agree that "government bureaucrats" are slow, the basic difference will be that you will get more treatment before they unplug you under a government plan than under the current scenario. So people will live longer.
Doesn't that suck?