Having worked amongst the public since i was 14.... Yes. Yes people are stupid. A person can be intelligent, even charming. People are shit.
Well the pic I posted shows that at least one person needs a silly rhyme to remember it. So yes some people probably struggle.
Nothing wrong with memorizing things that way if you want. It just shows the thing in question is harder for you to memorize so you need extra effort to do so.
I haven't gone back to read what you're talking about. For some reason I always struggle to say Abominable. So I break it down to - a bomb in a bull. It works.