I am using duckduckgo for a decade. But especially, I am using Firefox Saved searches a lot. I type mdn in the bar, and it searches in the Mozilla developer network. osm is openstreetmap, so is stackoverflow, w is Wikipedia, yt is YouTube... I often know on which website I will find the info anyway, so I use less a generic search

I used Kagi for several months, I guess I'd at least recommend trying it out.

I stopped using it, though, and I can't honestly say I've missed it. It was nice not having sponsored results, I guess, but overall it didn't feel like a transformative experience.

I have been using duckduckgo for a long time.