
Does this mean "what else is there to say?" I'm looking to check whether I haven't missed any nuance.

Yes, I think this is it.
"denn" could be left out without any change in meaning.

Would you say "denn" as an intensifier is "worn out" for being used much?

"Denn" can maybe add a slight tone of annoyance (but only if there is any - it depends on how you intonate the sentence - else it's really 'worn out')
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This sentence was initially added as a translation of sentence #4053944
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