Yes, I am one of those people with a firm opinion on the Oxford comma. Most writers know the go-to example case for it, and if you haven't, here's a great visual representation.
In my particular field of technical writing you don't see a need for it too often. If you're writing out enough variables it's often better suited to use a numbered or bulleted list.
But every so often I'm editing a piece and come across a sentence that can only be made better by adding that extra last comma. It makes my... let's be realistic and say hour.