I've recently enjoyed the German philosopher Max Stirner's liberal usage of em-dashes to add, at the end of his sentences — great emphasis.
> Before the sacred, people lose all sense of power and all confidence; they occupy a powerless and humble attitude toward it. And yet no thing is sacred of itself, but by my declaring it sacred, by my declaration, my judgment, my bending the knee; in short, by my — conscience.
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In any case, the "en-dash", as you seem to suggest, is not equivalent to the "em-dash", but typically used to express ranges or contrast between two words, i.e. "1990–1992" or "push–pull configuration".
> Before the sacred, people lose all sense of power and all confidence; they occupy a powerless and humble attitude toward it. And yet no thing is sacred of itself, but by my declaring it sacred, by my declaration, my judgment, my bending the knee; in short, by my — conscience.
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In any case, the "en-dash", as you seem to suggest, is not equivalent to the "em-dash", but typically used to express ranges or contrast between two words, i.e. "1990–1992" or "push–pull configuration".