I do not consider myself super productive but am often told I am, so I'm answering in that context. If I had one "secret" to what I do, it's that I'd rather half-ass many things than perfect only one or two, because half-assing is "good enough" for the sort of things I do (I should not be a civil engineer or nuclear physicist, naturally). When I see great people failing to get traction, I usually see a perfectionist unable to release their work quickly enough.