Do you think your potential customers are likely to use directories to find a business? If so, then it would be worth being listed in reputable directories. If you think they are more likely to simply search online, then being listed in directories is probably a waste of time.
You need to ensure you only use reputable directory sites, as low-quality directories are among the sites Google lists as in its guidelines on link schemes:
Additionally, creating links that weren’t editorially placed or vouched for by the site’s owner on a page, otherwise known as unnatural links, can be considered a violation of our guidelines. Here are a few common examples of unnatural links that may violate our guidelines:
- Low-quality directory or bookmark site links