I teach my students that when confronting goblins in the home uninvited, your shotgun better be loaded, and the first sound they should hear is BANG!.
"Racking" your shotgun tells the enemy 1) where you are, and 2) to possibly start shooting that direction.
Agreed. About 3 years ago I converted from a Mossberg pump to a Saiga 12 semi-auto. There is no finer close-quarters defense weapon, IMO.