You are speaking of a comparison to something that uses a tiny amount of power to something that uses a minuscule amount of power.
If you want to save WAY more power than any changes here, invest in a large USB power strip and plug in all your devices to charge on that. Those little wall warts waste more power than the the devices you are complaining about. One big one is much more energy efficient, than a bunch of singles.
And this is a drop in the bucket compared to properly insulating houses.