That depends upon whether a particular appliance draws power or not when supposedly off. If it is "instant on" or has a time display on all the time, or a "ready light" on all the time, then it draws power all the time.
So unplugging those would reduce electrical consumption.
And, so effing what? That power is insignificant.
Yes, over millions of people, that adds up. But, me, since I have not contributed to the population explosion and resource depletion, I say screw it. I'm not going to inconvenience myself. Let the breeders that have and are causing the problems conserve.