I've never seen one recipe that uses them. But maybe we just live in different countries.

A millilitre sounds like a crazy level of precision for cooking or baking, though. How is that ever necessary? I guess you're rounding to decilitres in practical use anyway?

If I encountered something like "150 ml" in a recipe, I'd assume it was written by a mad engineer and just use a measurement tool for 1 dl and put about 1½ of those. Makes life easier and the result will be just as good. Different nations have very different approaches to cooking, it seems!