Only seen it once (I'm SLF) when in the middle of a 90 minute slot delay on stand on a MAN-AMS a number of years ago. It was BA, and the corresponding KLM flight had just trundled past us going out on time. There were a number of pax chuntering loudly about this, which was obviously fed back to the captain. He appeared in the cabin, apologised for the delay, and walked round answering questions, which totally defused things. Probably also helped him by allowing a leg-stretch rather than spending the time strapped in his seat.
As others have said - used correctly, and when operational circumstances permit, it can be a very powerful tool in a captain's armour.