[gindely]

Australians, Indonesians, Germans all measure recipes with two kinds of spoons (!). Australians also use cups (that are 10-12 mL bigger than American ones); other countries may too.

I wonder if the ideal country where no-one uses units of volume other than litres and millilitres actually exists.

The really bizarre units of volume are certainly the ones I've seen in Europe - where you get measures marked in "grams of flour" and "grams of sugar". I suppose no-one has ever asked for a hundred grams of sugar of flour, but I'm tempted to every time I see one of them.

[SAI_Peregrinus]

"Grams of flour" isn't volume, it's mass. You stick your mixing bowl on the scale, hit "tare", and add flour until you hit the right mass. Then hit tare, add the next ingredient until it hits the right mass, etc. Much more accurate, which is needed for good consistent baking. Also much faster.