I do.
Although "blisteringly fast" could be stretching it a bit. My commute in is 14.8 miles 1way, every day, I make it in just under an hour.. which is right around 15mph.
Traffic lights, stop signs, head winds, all effect the ride time. I start out in a suburban area on the outer part of the city limit. I transition onto a MUP (less than 5 minutes) then onto inner city residential streets, through a park (Parthenon) then into downtown.

That being said, all thing being equal, I still have slow days. Usually it's Tuesday for me. I don't know why.
Yesterday afternoon, I left about ten minutes early and kept reminding myself; there's no rush. It felt good when I got home.
I ride alone so the only thing I'm racing is the clock. My more enjoyable rides are when I don't take note of the time and simply enjoy the journey.