I know that header files have some pretty horrible issues with templates and cyclic dependencies and so on, but from an organisational perspective I really like them. If I have to implement some complicated algorithm I could easily have a thousand likes + of Code, but the header still quite nicely shows the general structure in one or two screens. Whenever I do classes in python I start wishing for headers at like 300 lines, simply because I loose track of all the functions I already made.
Maybe I'm just not a good python programmer tho.
I think it's also just the case that the source material just contains a lot of action. In my opinion the general world building etc was incorporated pretty well between the action stuff.