I prefer the “fold it haphazardly, stuff it in the drawer, and I don’t care if it’s wrinkled when it goes on the bed next time” method, myself.

Whenever I tuck the corners into each other I end up with a lumpy irregular polygon which can’t be folded neatly like flat sheets

I've learned how; can't speak for everyone though. But they're the ones that take the longest time due to the intricacy.

I'm also very meticulous about folding laundry, so everything fits nice and tidy in the linen closet.

I watched a video once and it was like 17 steps to do it so I couldn't actually follow it. I did get the put the corners inside each other part though, and if you do that it gets you at least somewhat folded enough to stack with the rest of them.

fitted sheets you say ? this is why i have a gf /s

Oh... Finally I understand the meaning of the english "fitted sheet". Thank you stranger!

Or you can do the parachute fold. And then fold it regular after it's a tube