Most code most people work on isn't about algorithms at all. The most straightforward algorithm will do. Maybe put some clever data structure somewhere in the core.But for the vast majority of code, there isn't any clear algorithmic improvement, and even if there was, it wouldn't make a difference for the typically small workloads that most pieces of code are processing.

I'll take it back a little bit, because there _is_ in fact a lot of algorithmically inefficient code out there, which slows down everything a lot. But after getting the most obvious algorithmic problems out of the way -- even a log-n algorithm isn't much of an improvement to a linear scan, if n < 1000. It's much more important to get that 100+x speedup by implementing the algorithm in a straightforward and cache friendly way.