Haha yeah this isn't exactly an unbiased group of marketing automation users. Go Marketo! That said, there is a group called Marketing Automation Experts that may be a good reference.
I have heard mixed reviews of their workflow diagram interface. Some love it, some find it odd. I haven't used it myself since a demo 3 years ago though.
You might try g2crowd.com and LinkedIn as better communities to tap for this info.
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