I'm nobody special, but I have contemplated "speed holstering" of late too. Sometimes at our tactical team training we do pistol dry fire, and it inherently turns into a game of "how fast can we get XX reps in". Stupid, I know.
I hated hate hate hated how some people speed holster so they can prep for the next "threat!" or "gun!" call. I'd barely get the hood back up on my holster and they'd be calling the next rep.
Thinking about it from a police officer's view, what if I've got my pistol out and somebody runs at me with empty hands? I'd rather be able to toss my pistol in the holster fast to grab another tool or strike. Just another point of view with regards to holstering speed.