Trevor and John, I'd probably use InDesign too, since I have it. But I acquired Illustrator years earlier, and I associate InDesign with typography and text. My personal experience or shortcoming only. The few flow charts I had to make (long time ago, between 1990 and 2005) were very easy to make in Illustrator, and that included true flow charts, showing the processing of oil in a refinery. No templates there.
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