>Does the time spent writing feels worth it to you?

Writing is an additional form of learning for me. Just the thought of sharing with someone makes me to do my research better, verify my assumptions, etc. I look up my posts first over docs/online-search if I've written about a topic before (and often, I'd have added related links which would be easier to follow compared to fresh research).

>Did it help to get noticed/ find jobs or other opportunities?

I sell programming ebooks, so having a blog helps in marketing.