I absolutely love that too.
One of my favorites is the electric fences in combination with a more classic bunker/fort build.
Watching zombies dance to the tune of several thousand volts is a beautiful sight.
I've been using the new Sledgehammer turrets to knock them back behind the electric defenses once they get close enough. Even better with a flaming mod in the sledgehammer, to see them get roasted in more ways than one!
The highlight was when a spider zombie tried to jump over the defenses, and got sent flying all the way back. HOME RUN!