Peafowl are definitely excellent avian alarm systems, but having had both peafowl and geese, I can say with certainty that people are WAY MORE terrified of geese (even benevolent ones) than peafowl (or guineas)! I don’t know why that is, but I only had two and they were friendly with people, but the meter-reader, for example, would drive his pickup truck up the electric pole, roll down his window, and half-climb out to peer at the meter. Anytime visitors saw the pair bustling up to say hello, they would panic. Maybe a good portion of the population has been bitten by a goose at some point in their lives?
I know for a while, at least, some military bases in Germany were using loose geese to patrol the grounds, because, unlike dogs, they could never be bribed by a stranger with food!