the old advice to "sit on your hands and count to x"
was most certainly not given to me during my commercial flying training.
Quite the reverse: my instructors always criticised me in the sim for being too slow and regarded it as evidence of a slow mind.
Thankfully, the attitude of Captains on the line has been quite different and my more careful approach to the serious business of flying is now applauded in my line checks. Furthermore, by learning at my pace and refusing to be rushed, things are now deeply inbedded in my pea-sized brain and my pace has quicked without sacrificing care.
There are very few situations where speed is more important that taking due care. In fact, I can't think of any.