Hey, with many addons, maps, game modes, and more in Gmod it's hard to find some of the best and upcoming addons for your game.
Here are some articles to help you have more fun in Garry's Mod.
Maps
Addons
Horrors Maps
Weapons
GameModes
Only thing drive me crazy is all these new horror games nowadays is its so dark, all time. I can't even play them. I understand they trying to create spooky but be creative a little, not just darkness with pop out scare scenes.