Earl, when Cat II and Cat III operations are in use the whole airport operates to an even higher standard than usual. In particular no vehicles or planes are allowed in the protected zone. They are "very" careful about inadvertent interference with the landing systems.
We train to 20' decision height, 100 metres visibility. Basically if the plane can handle it, it we let it do the job, if the little red light flashes, you push the levers up and get out of dodge.

You make a good point! My hat is off to you guys who can sit there to 20 feet and make a decision about continuing the landing. Maybe at one time my brain would react that quickly, but no way it would now.
One of the things which I enjoy the most in all the years I flew was instrument flying!
One of the things which amaze me today is the change in weather patterns. When I was instructing full time back in early 60's, we could plan a student pilot's cross country training flight a month in advance and be 99.9% sure weather would be no problem. Now days, its hard to say what the weather is going to be in 3 days, let alone a month down the road.
While it is true that weather forecasting is much more accurate today, it seems to be more violent these days than in the old days. Maybe its because as I got older, I either got more concerned about weather or grew a more healthy respect for it, don't know which.
I know things are a lot safer today than in the 40's, 50's and sixty's, but will have to admit, with nothing but a needle, ball, airspeed indicator and altimetry, and a "A" and a "N" in your ear, it was a lot more fun back then.