Tiger - I can understand your point that "most usual decompression is a slow one" and gives the lie to the Hollywood delights of telling folks otherwise.
But you say,
paxs don`t realise anything is wrong...they can still breathe so they just look at the mask and carry on with there in flight meal, drink or reading The Times.
Whaaaat? OK, in 36 years, I have never seen them deployed but if they drop, you pull mask towards you this action opens the flow of oxygen and you place it over ... etc.
Don't you? Don't they?
I am really gobsmacked by this one. I had supposed that the appearance of masks would lead to near panic!