I gotta say that although I agree that a hospital isn't an amusement park, I appreciate the visitor aspect, too. I had some emergency surgery a few years ago and had to stay 3 days, and it still touches me to remember the stream of people who came to see me--some came by before I even was awake enough to realize they were there.
My mother works as a transcriptionist in the pathology lab at the hospital here, and they have even made a big deal out of having her department wash/sanitize their hands frequently. They don't want to send anything bad home with them.