I enjoy and definitely prefer using C# and GDScript for anything game development, primarily using Unity or the Godot Engine. When it comes to modding, which has been primarily for Europa Universalis IV, it uses a inhouse scripting language with some elements of LUA.
Speaking of Europa Universalis IV, I created a tool for modders to help speed up the creation of mission trees for the game which can be viewed HERE. It is a desktop application which outputs txt files with code snippets based off what the user designs. This was made using the Unity Engine.
My time as a modder has been fairly active, most noteably participating and for a time running a Multiplayer community and modification for a server consisting of hundreds of players, that being Hashinshin Multiplayer or HashMP for short.
Modifications: