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@warner After installing the plug-in, you have to add the link where you want it using a custom theme. See the instructions on the plug-in page.
My email addresses have been public on the web since the mid-90s, so I really have no concept of spam volume before and after. 😊 Of course, I get spam, but it's kept away from my inbox thanks to spam filters.
That said, the web is vacuumed for email addresses all the time. If you use this plug-in, the address will get picked up sooner or later. I might add support for obfuscating the email address in the future. There's no 100 % protection against scrapers and email harvesters, though.