We have never owned a crib or bassinet by the bedside even.
I may be wrong, but I remember hearing it was during Victorian times that this became popular.
I know there are people afraid of smothering or crushing their infants. Most negative studies seem to come out of the US. Other countries don't seem to have the same issues cited in US studies. I think it is common sense not to sleep with your baby in bed if you have waterbed, or tons of pillows, a soft mattress and a fluffy comforter.
My wife and I don't drink alcohol either, so no possibility of being so drunk that we would be unaware of smothering our baby, and neither of us is hypermobile in bed. All mammals keep their young close. The 'co-sleeping' is a modern term that makes it sound out of the ordinary, but in fact it is very ordinary.
People will say they slept better and the baby got used to being in another room, or across the room, but I can say from three babies worth of fathering, they get comfortable real quick being in bed with their parents.