... if you prefer to spend an hour for each workflow painting it all over again, you might consider the Confluence plugin Gliffy which is pretty powerful and lets you create all sorts of diagrams, but is not free.
I don't think Gliffy diagrams would have any significant advantage over screenshots from the JIRA workflow designer for documentation purposes: Gliffy diagrams do look good, but why spend a lot of time re-constructing workflows in Gliffy when you can just make a screenshot of them in JIRA?
I found an old plugin that converts JIRA workflows to SVG or PNG, but the latest version seems out dated and has 0 download (presumably because it's faster to convert a workflow to PNG by pressing PrintScreen rather than installing a $400 plugin.)
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