Hum not so much really, I like to be on time, but don't really use a timer a lot.
I will though when I am exploring new types of teas and following peoples suggestions on how they like to brew.
But after a a few tries, it's pretty set into the brain.
I have gotten pretty good at weighing tea leaves and water by sight, and timing in the back of my head without literally counting. Still not exact though, that will take much more time.
I have almost mastered the art of pouring water into my electric kettle though
One swoosh and I have just the right amount for an infusion in my work pot. A different type of swoosh and I have just enough for a rinse, a steep, and a pre rinse for my work pot (this also happens to be the exact weight where the kettle will go by itself without me having to weigh it down while it is running