I also remember working the order taking window and getting into the flow of quickly finding the items after you master the educational part. In a way it's like lego-building or very simple programming.
It's amazing, but it's also a bit distracting. Thankfully, as you're coming down off that high the music often comes down too, and it guides your emotions back into a calm flow, ready to build up for the next release.
I sometimes write code at the rhythm of those songs, and it’s amazing for my productivity.
Been crew trainer in a german company store next to an exit of several Autobahn crossings, doing mostly late/night-shifts around 1989/1990. Was some sort of internal flagship store because all managers of the area met there often. And we trained the 'franchisies' opening their own. And the f.... "Blitzcontrols". Always found something. Never got 100 points, only 98 or 99. GRRRR!
The pay was amazing btw. because at that time late/night work got huge bonus mandatory by law. About 4800,- Deutsche Mark every month. Nowadays not anymore.
Anyways, when several busses arrive at once because of some soccer games you have to 'flow' in sync with everybody else. We did. And had fun while doing so.
When you tame that chaos, and it's saturday afternoon when all the best people are there and everyone is on their game... I've never experienced anything like it. It's like when you see a really amazing play in your favorite sport, but that same amazing play goes on for a couple hours. I imagine it's like being an air traffic controller or maybe a stock broker on the trading floor where you can talk to everyone and it's productive chaos at its glorious peak.