Having an easily-searchable version-controlled record of my "things I'll have to Google again" has been incredibly useful for me.

The current incarnation of my "lab notebook" is here, and as of today 1002 days old: https://serhii.net/dtb

The most surprising thing for me was it's ROI was much higher than any other bookmarking / PKM stuff I tried, and I tried a lot. I had/have a semantic mediawiki for links, with tags, categories, estimates of complexity and ratings etc etc etc, but apparently searching through a long textfile or browser page is still much faster