You'd THINK someone at Samsung, during one of their design sessions, would have said, "Hey maybe we should do something to make the lens be sunken in the body of the phone, or perhaps put a raised ring around it, to reduce contact between it and other surfaces."
But no. They made sure it's fully exposed and in harm's way whenever you put your phone down.
I do have a rubber glove for that reason but I'm tempted to take it off because I don't like the extra bulk it adds to the slim phone.