Giu, After seeing your "heave to" video I practiced it several times to acquire it as a natural instinct. Now I heave to if I want to have a meal, take a nap, etc. Precisely last summer I practiced it as a MOB recovery manoeuvre: threw a lifesaver ring overboard and hove to. It is amazing how close you stay to the "MOB" no matter in what sea condition. It definitely gives me a much higher feeling of safety for the people onboard knowing that if they ever fall OB I'll be there with them in a minute.
And whenever I sail with someone I teach the trick to him or her (just in case I happen to play the roll of the lifesaver one day).