I think @inquiry was on to something there. I've become convinced that weekends pass so quickly because we spend five days a week wishing time away. Of course there's some inertia -- by the time we get used to not wanting time to just pass faster anymore, it's Sunday evening.
A few years ago, when I decided to go freelance and quit a very lousy corporate job, weekends would be gone in the blink of an eye. They're slower these days, but certainly nowhere near as slow as they were 15+ years ago. Corporate PTSD takes years to wean off, it seems.
So yeah. Mine was nowhere near as slow as I wanted it to be, either...