Cristina7, my ds was also in SCBU for 3 weeks after birth, and we were told the same thing, not to look at other people's babies when we visited, which I thought was fair.
The problem, however, was reminding grandparents in particular not to do this. I realise that people naturally enjoy looking at babies, particularly new-borns, but we were embarrassed at our elderly relatives pointing and cooing through the glass at the other tiny, helpless bundles, as though they were exhibits. I know that I would have been very upset if I'd known there was a possibilty of strangers looking and commenting on my ds in my absence.
For this reason, I find that the ban on cooing at the West Yorkshire isn't at all surprising or extreme.