I think a lot of it comes down to personality. For example, when I'm working on something - say a budget program - I want the screen to change instantly when I move from one area to another. I remember in the early days of personal computing, it was typical to have it take a moment to do something like that. heck, some programs could take seconds to switch from one thing to another.
Or another example would be when saving something. Early computers often had to finish the save before you could continue your work and that could take time.
One of my brothers didn't mind at all. His reaction was, "No big deal in waiting 5 seconds occasionally". And that's true. The actual time wasn't really meaningful. But it drove me crazy because it interrupted the basic flow of my work. So, not time, but disruption that mattered to me.
Even though I'm not a super fast typist - but fast enough - I would certainly like to be even faster so any delays are by choice, not because I can't go faster.