I believe lots of link builders attracted by directory submitter tools
It save lots of time in directory submit process.
But the site effect....
Most of the time it doesn't submit to the right category of your site, it mean, you are wasting your effort in putting your site in not relevant category
I prefer doing it manually. There is no better way than to trust your better judgement in selecting which directories to submit to and which category than relying it on a software ;)
you didnt say "automatic" directory submitter tools. I think its not bad using those tools just be sure you check it twice before clicking the submit button.You can disable the "automatic submission" button. Just the necessary ones.