Great post about hybrid productivity. I have learned not to rely on one app or pray for one app to do everything. I've seen the OmniFocus forums with feature requests to make OmniFocus become a Swiss Army knife. They'd like to add mind mapping (or visual view), reference storage (similar to DevonThink or Evernote), a full blown calendar, and whatever tool imaginable.
I've always thought of my workflow as a toolbox full of tools. A handyman needs a hammer, a saw, screwdriver, various wrenches and pliers, and so forth. Each tool is suited for a particular use.
I've assembled a suitable array of tools ranging from mind mappers, outliners, writing, drawing, technical illustrations, project/task management, and correspondence. I wouldn't go back to the days of AppleWorks that tried to do everything.
I love using OmniFocus and use it in combination with a simple notebook to help capture thoughts and ideas. I use index cards to write my 3 tasks to focus on. It provides better focus. If I open OmniFocus to look for tasks to do, I might end up getting distracted looking at other projects and tasks.
Oftentimes, I'll doodle or mind map on paper and then take a picture to save to my DevonThink database for future reference.
I can't imagine going digital only when I have analog tools to use that works just as effectively.