Good question Nick, I have been using mnemonics off and on since my teens in the late 70’s and have asked myself the same question from time to time. Regarding practical use cases, I am a software salesman, selling enterprise software solutions to regional and global enterprise companies.
My company has a broad array of products that would be difficult for any person to digest absent many years experience. From time to time, i am involved in preparation for presentations and find myself memorizing product highlights (bullet points of the value or capability, etc.), that I work into my pitch or sometimes just fill out a sidebar conversation with during a break.
More frequently, I am hosting meetings where anywhere from 3 to 30 or so people attend. In the larger meetings, I’ll bring in an expert who does most of the presenting. In either case, before the meeting starts I memorize each persons name and job title and then during the meeting I’ll peg their name with some question comment, or topic where they may have made a face to exhibit skepticism or interest. At the close of the meeting I do a brief recap during which I work in everyone’s name and the topic they responded to during the meeting. After years of doing sales meetings, I can say without doubt that the receptiveness to follow up calls is way better due to practices like this.
Over the years I’ve had several use cases specific to my life at the time. When I bought a sailboat (40 foot sloop) and was learning to sail it, I would memorize procedures for things like man overboard drills, rules of the road for navigating heavy boat traffic in channels, sail trim procedures, water depths in specific areas around source and destination marinas, etc. until it eventually became habit.
Early in my career I was a reactor plan operator on a submarine in the US navy. Every nuke sub sailor has to memorize every valve, switch, meter, gauge and thing-a-ma-bob on the boat before becoming “qualified” and being awarded a dolphin pin. There’s a lot more to it than I can describe in a sentence, but using mnemonics cut my qual time by about 2 months.
I was an electrician for a while and everything was color coded, as a degreed mechanical engineer I worked in the automotive space for a while replete with procedures, etc. I could go on and on really. You either use this stuff your you opt to take the scenic route. Now days, I can’t drive down the highway without memorizing license plates… totally useless, but I just can’t help it. Hope this helps.
Mike