Slightly controversial hypothesis: This expertise is magnified by concise languages. If it takes hundreds of lines of IDE-generated macroexpansions to do anything, you can't see as easily when code is too long.
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One thing you learn about programming from experience is how much code it should take to do something. So an experienced programmer will be suspicious of code that yields correct results but seems too long. A novice only knows it yields correct results.
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It goes the other way, too! An experienced programmer will also be extremely suspicious of code that seems like it needs to be longer, given the requirements (e.g. needs to cover more edge cases), but is too short. Will suspect code of being written only for "the happy path."
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Or code that yields carrect results but seems too short. It either contains an element of genius or it doesn't work for all inputs.
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I bet it wouldn't take much code to create an edit button.
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An expert knows to make it much longer than it could be, because the priority should be on a future programmer (including you) understanding it.
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Some times, we do leave some earlier code as unused functions to be deleted later. (Kind of like we stuff our house with things we don't need anymore but scared to throw away). So may be, running code coverage to make this call is better...
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Too complicated to be correct
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I'd say CPU speeds appeared to solve that problem until "big data" became en vogue. In those problems, thinking in nanoseconds instead of milliseconds can save you $$$$ on hardware and/or cloud time.
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