Has anyone actually found these directories to be useful? I suspect the only people browsing these sites are our founders and not potential clients. Do they really offer any SEO improvements?
HackerNews is listed as one of the directories. When I submitted my project (soon to be startup) I got a ton of support and advice, it was invaluable. That being said, I don't think it would have worked if I hadn't made a very personalized message and responded to all the comments.
Exactly, if you can't be bothered to submit it yourself and chat with potential users, or even just other makers providing feedback, then you probably won't succeed.