Ha! I've always folded fitted sheets like that - seems the obvious way to do it. I loved the way she pointed out 'this is the unfolded sheet - and this is the folded one - duh!
I am a creature of habit and do the sock thing, fold underwear the same way, towels along their long side into half and then into 3, roll hand towels and keep on a shelf in bathroom with their smooth edge out-the-way, cutlery has to be in order with forks & spoons 'cuddling' the next one; ironing, I taught myself, same for cooking. As for the rest of the house, it is a complete guddle.