I've only ever seen cots during widespread IRROPS, not as a norm. Once arriving into LAX there were lengthy delays for stands and the queue at the rebooking centre as I walked through the terminal must have had 100+ missed connection pax in it and the cots (I'd call them camp beds) were laid out everywhere, most occupied. On two other occasions where my flight was late (after midnight) but the airport was otherwise running well, there were no cots around.