All I can figure is I've been in a totally different part of the market from these folks. I've never once had a job search that looked like that. Typically, I do 1-3 interviews after 1-5 applications, and come out with 1-2 acceptable offers. I don't think my total application count in a given search has ever come very close to 10, let alone 100 or 1,000. Or, the last couple times, I've just gone, "yo, I'm looking" and had someone in my network hand me a job (I get that's a later-career thing—but my early-career searches never, ever looked like these application-gauntlets, either).
I doubt I've sent 50 total applications in a 20+ year career, which career includes most of the usual job-hopping-for-more-pay, so it's not because I'm doing very-long stints with single employers.