I used to try DDG a few years ago but eventually switched back to Google as default. Now I have it again as default since a year. Not sure when or how it happened but since a few months, I almost exclusively use DDG, switching to Google maybe once a week. Indeed that's then usually for niche topics. On the other hand I think my search and surfing behaviour also changed. I'm starting to rely more on Bookmarks again; also I'm actually reading websites again and browse through them instead of just CTRL+F-skimming through them...