Is this mostly about saving time, saving mental effort, simultaneously finding tangential content, aligning with some ideology, or something else? Actually curious.
For the most part it's just coincidence and me trying to keep myself away from a computer screen. I try to keep what I do on the internet in a narrow purposeful tract, so that I don't spend more time on the internet than I really need to. It just so happens that the things I really need the internet for rarely involve search engines.
I do use googlesharing just on principle, but that's pretty much the extent of my ideological reasoning.