I would like to add my feedback.
I am not a writer but a Storyteller and player for pen & paper role-playing games. In the past 15 years I did this always with minimal writing and preparation. But I had always the preparation problem.
I was mostly unprepared and I had hard time to make my notes with word or other tools.
I tried various tools, but I had the biggest success with scrivener. It is fun to use and I write today a lot more then I did wrote in the 15 years before. This is the biggest success an application can achieve from my point of view.
I especially like the easy way to print the Data I need. I can pick the stuff for printing based on the demand I have. This gives me tha ability to manage the story in one document but deliver the story as requested / needed by the play.
The only bad thing about scrivener I found so far is the usability of the tables. I do not need more functionality scrivener offers. However the handling does need a lots of love. Sadly I need a way to structure some data on a page, and the classic approach is a table. If someone has an alternate Idea that works within scrivener I am happy to try.