I’ve had more or less the same results. It’s interesting, and works fairly well, but you need a whole bunch of identical shots. I’d rather keep the tourists and save the memory card space while I’m on vacation.
But like yourself, I use Photoshop every day and didn’t know this trick. That’s the crazy thing about Photoshop – you can learn the surface level stuff easily and really get good at it after awhile, but even after 20+ years of using it professionally, I’m still learning new tricks and techniques buried in it. I had a boss once who’d mastered using a combination of keyboard shortcuts and the Custom filter. He rarely touched a mouse; he’d just open up an image, start typing keyboard shortcuts and plugging numbers into the Custom filter and the images would transform. No idea what he was doing.