I've been (over) using em-dashes ever since I discovered them. I have no intention of changing.

Curiously, I find in editing my dad's auto-biography that a certain generation went crazy over-inserting commas — wherever they think you might want to pause to take a breath or something. To my eye (ear?) the result is a staccato sentence.

But the truth is I know nothing about grammar rules — I slept through sentence diagramming in elementary school.