I respectfully disagree. You can get hit with 1 million volts and if the amps are low you'll survive. But 50 amps even at low voltage will do you in. I like to think of volts as the height of a waterfall and amps as the volume of water coming over that waterfall. A dribble coming from a high waterfall won't really hurt that bad. But Niagara falls will kill you.Actually, it is the voltage. Killing a human requires only 10-50mA, which translates to ~50V with a typical resistance of the human body of ~1kΩ.You can safely touch both poles of a (12V) car battery - which can deliver way more than 50A - without any problems.
The real danger with electrical shock is amperage, not voltage. Learn what the difference is and how to stay safe when working with electricity.
You should always make sure charging has stopped first, and then first unplug from the car. But the outlet is still hot, and it's still recommended to throw the breaker before unplugging the EVSE.I wouldn't recommend (un-)plugging that circuit under load, though, to not fry the contacts. Make sure charging has stopped in the car first, no need to throw the breaker then. When throwing the breaker while charging repeatedly, its contacts might fry over time.
I'm not in anyway diminishing the value of plugin EVSEs -- I own one! But in the 5 years I've had it, I've unplugged it maybe 3 times. It essentially acts as a hardwired connection as it should be given the electrical load. I only bought a plugin because I plan to take it with me if I move. Otherwise the connection is permanent.