What exactly do you mean by "seriously"? For me it is easy to remember how many spoons or cups i need to cook something, if the recipe does not require specific or precise amount of ingridients.

Okay but i dont think people cooking seriously use it in the us or canada either. Also depends on what serious is. I think this mainly refers to people cooking just in general and in that case many recipies are gonna contain cups and spoons. Especially here in sweden for example.

Anyone cooking seriously doesn't do it in a lab.