Everything. “How far to the restaurant?” “18 cups or so”
'The music is too loud, turn it down a few cups!"
I do actually like weight better for measurements, have a scale and that IS easier, agreed. But most recipes don’t need to be so exact, and not everyone has a scale so volume measurements work. I just use a regular spoon for teaspoon and have cup measures, a small coffee cup here is 8oz, we have some of those too.