Have you bought a computer for someone in the last five years? I am not talking about power users, I am talking the friend or relative that looks to you for technical guidance. Almost every time I have heard the same thing, "This is so much faster/better than my old one". Sure, a large portion of that is due to less crapware and software improvements but it is a noticeable difference to most users and they appreciate the additional processing capacity (although they may not know that that is a factor in the improvement).

Computing isn't a limiting factor in almost anything we do (I occasionally code and test on a raspberrypi) but we do notice and appreciate the improvements that performance bring. Even naive users notice.