I suppose it's similar to the situation with newer cars, where the engine is so quiet that one sometimes forgets whether it's even on, and attempts to start it again. There have even been laws introduced to make sure that cars can be heard: https://news.ycombinator.com/item?id=8925126
And to your comment about cars, it seems to be more about pedestrians that can know about an oncoming vehicle and less about whether the user thinks it's running. The latter seems to be something that can be easily fixed.
I mean, swapping used to be a fact of life in the late 1990s and early 2000s, even on Linux - RAM was just too cramped back then. But then we got machines with lots and lots of RAM even at the low end, and Linux became snappy and quiet-- while Windows is still as bad as ever.
RAM is, I feel, one of the more precious commodities on a machine, still. I have spinning rust in my machines (more space/$), and I've not regretted it, or really had a need for the speed an SSD could bring. (If anything, I think I'd do a hybrid install, with a small SSD and a large HDD.) But I've never once regretted upgrading RAM on a machine, and I definitely miss it on my work MBP.
But the grind of the hard drive when something happens. I never would have thought of that again had you not made this comment. Crazy nostalgia there.
So there's this notion in video gaming where you're strolling through a forest or in a cave or factory or some sort of level with no enemies, no battle music, but you suddenly find yourself upon ammo crates and health packs.
Indicator that a big fight was about to happen.
For me and my early voyages through computing, learning how to write little programs and messing about with settings to see what they did, if I ever got stuck on a problem it was THAT noise that told me "hey you're onto something here".
What a time.