What do you enjoy the most in Gmod?

Personally, the thing I appreciate and enjoy the most in gmod is that you can program it to do a lot of things, but more over what I like about it the most is all the different kinds of war contraptions you can build, I personally love to make planes and drop atomic bombs on my enemies.

I like to make easy SENT addons, and use wire to make things.
Like this: http://wiki.garrysmod.com/?title=Wired_pet