It's an interesting phenomenon. Personally, I find that the longer I mess around with ∗nix, the more I rely on older tools (e.g. man pages instead of google, coreutils bins instead of other specific tools, etc.)
This also has the side effect of stoking my interest in the history of ∗nix and computing in general. It's kind of fun tracing posix arcana, terminal voodoo, or whatever back to it's, often haphazard, historical origins.
The story of why we have /usr/{bin,lib,sbin} etc is somewhat infamous. A cute one is how sed is a portmanteau of 's' and 'ed' from the 's' (substitute) command in ed, and grep is similarly shorthand for the "global" command 'g/RE/p' where RE stands for "regular expression".
Anyway, I ramble.