I love going back and reading stuff from nearly 20 years ago... like a little tech diary. On a bunch of occasions I've used it as a reference when I remembered "I did something like this 10 years ago..." and dig up the posts.
Oddly, its also help me get my last two jobs too - in the interview, someone found something on my blog (that they looked at that morning before I came in) and we've had a conversation about it. The topics weren't directly related to the position, but showed my interests (Like, a post on a small webgl voxel thing I made helped get me a job at a mainframe company!).
I can choose where I want to work now, so I feel like my blog is a helpful filter: if a potential employee doesn't like my blog, it's probably not a good fit for either of us.