I'm curious to know the workflow when creating a game in Unity3D?
Does it generate a lot of code for you?
My understanding is that you describe the game in Unity and do scripting on the back end to do the logic. Kind of like you use Unity to describe the puppets and you use a scripting language as the puppet master.
In Unity, as a basic idea, I tend to think of everything revolving around "GameObjects". Any script behaviour, meshes, materials etc are pluggin into this gameobject which is then placed into the scene. This game objects, with its scripts and behaviours then interracts with other gameobjects in the scene to move towards the programmer's ultimate goal.
Thats the most basic, least technical description I can think of currently. With respect to what you have in mind i think its pretty close.
If you are asking if you need either code experience or a coder to bring your game to completion the answer is yes. Unity has a lot of built in functions but accessing them (most of them) requires scripting knowledge.