It's worth it for me in the sense that I blog to process my thoughts, learnings, projects, and experiences. Blogging helps me do that, and since that's the point, it's worth it.
In terms of getting noticed/finding jobs, my blog (https://liza.io) is not super high traffic or anything. I don't market it. I don't even usually tweet about my new posts, even though Twitter is my one active social media platform. But I have had recruiters mention checking out my blog posts and sometimes reference my blog content. I've also had interviewers mention my blog and ask about personal projects I've written about in the past. I also used some of my blog articles as supporting material when applying for a position that featured a lot of technical writing. So I think that even though improving job prospects is not the primary goal of my personal blog, it has been a bonus.
Another bonus has been getting occasional emails and comments from random readers to say a certain post has helped them. A while back I wrote a post about testing external API calls in Go, and have had a few people reach out to thank me. Though I write primarily for myself, it's always nice to see when someone stumbles across my content and appreciates it.
It's also always cool when a post ends up in newsletters I've never heard of. I don't have a consistent way to detect each time this happens, but can sometimes trace back traffic through a referrer or notice a backlink from a newsletter archive.