The overall view is really only something that is obtained after you've been handling it for a while. Being told once or doing it once isn't still going to give you the overall picture and neither is a flowchart or cheat-sheet most likely.
Different learning styles prefer information in different formats. So if I can put up a flowchart and it helps even 5% of my client base, that's 5% that have a greater confidence in both their own skillset and in my ability to provide quality support / expertise...and more people who are more likely to refer clients to me as someone who provides superior support and resources. Some people have no use for flowcharts or cheatsheets. Myself, I dislike having only "instructional videos" as a learning tool - it forces me to go at its pace, rather than my own. Each person digests information in their own fashion.
Creating documentation is an investment - same as buying quality hardware, or a billing system that works for your business. Do it intelligently, and maintenance / updates are minimal...and yet the documentation is still usable, even years after it's been created.