The strong point of unity is the workflow that is profesionnal tools !

In world editor : import a model, assign textures (or load from directory) , choose shader , edit animations names and length for animated models :
All that in the world editor : Just big

-Want to edit terrain just do it right here in the same world editor !
-Want to edit physic properties , just do it in world editor also.

Caus all core have been written in modern interface graphics, it look clean and allow all sort of things like panels, drag and drop elements on others.