I think they realised it didn't work so well in the late 80s early 90s.
But doctors are totally different and it depends on where you live as to how the protection works. For instance I as an EMT couldn't perform a tracheotomy with a pen, like George Clooney (ahhhhh), because I know that I don't have that level of skill. So if someone tried to sue me they might win. But if I just did CPR they could try to sue me, but it most likely never get anywhere near a court.
I guess that all changes with a doctor because they have so much insurance.
I think it depends on the case. It is easier for the common man to get compensation in the US, but not everyone uses it wisely.
I AM referring to the McDonalds coffee case. She asked for just enough money for her bills they refused and they had been sued a number of times in the past over that very issue. They knew, they didn't care, they could have easily done something about it, they chose not to, they lost. Coffee shouldn't be so hot that it burns down to the bone.