I use Firefox on a Linux workstation. I do not foresee that changing in my lifetime.

I only use LLM's to somewhat validate my theories but I give them very little weight as they can not think critically or even think for that matter. They sort the garbage they absorb from the internet and look for consensus. Even billions of people can be wrong which means LLM's can be wrong.

Yes, it's about speed/efficiency and instant answers. A couple of years ago one would usually have to skim multiple articles to find the desired information. Now, the answer is often immediately available without further searching.