To be honest, I wasn't even aware of this whole thing until I saw this thread a week ago and then a news story yesterday.
Personally I don't like the idea of them signing us up without our permission and then us having to go to the trouble of opting out. I don't like that at all.
My main problem is what use the government of today and possible uses the governments of the future will put your private health information to. For instance imagine if you were going for a job in a government department and they checked and saw you had taken considerable stress leave in the past because of a note your GP wrote you a decade ago. Think they will employ you over someone who doesn't have that on their record? I don't trust the powers that be one bit to not pull something like that. And considering how the government walks hand-in-hand with big business (can anyone say 'giant tax cuts'?) I don't trust them to not eventually 'accidentally' share our details with corporations.
"And it says here Mr Simpson, that you once held a dog by its back legs and walked it round like a wheelbarrow"
"I was ten!"
"Well it all goes on your permanent record"