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It’s a hot topic among copy editors — in the US more than the UK.
https://www.nytimes.com/2019/08/14/style/em-dash-punctuation.html
To my ear, it has more of a dramatic beat to it than an en dash. Its slightly longer diving board lends a pause somewhere between a regular dash (en) and an ellipsis.
Not to be used to separate parentheses. Apparently used like this:
https://en.wikipedia.org/wiki/Wikipedia:Hyphens_and_dashes
I've never seen the point of those. For me, the En dash isn't sufficiently distinct from a shorter hyphen.