As names, car and cdr are great: short, and just the right visual distance apart. The only argument against them is that they're not mnemonic. But this is a weak argument.
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Why? Because it’s easier to type? Most editors have solutions for tab-completion and snippet expansion.
Short names are easier to read in themselves, and lead to less line-breaking, which makes expressions easier to read. It's particularly important that commonly used names are short. The most commonly used words in natural languages are short, and it's not a coincidence.
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Ok cool, then I think we just disagree on the design tradeoff. I prefer code that is as explicit and intention revealing as possible. Your point about being concise is exactly the excuse people use for littering decks and blog posts with “expert terminology” (ie. jargon)
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Good argument, but I find it more time consuming to reference docs just because I forgot a name. And if you forget the name, it's hard to search / find.
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As for the fact that it's easy after a week, in my opinion the 'usefulness' of a language is directly related to its popularity. So does it not make sense to design for shortest time to learn / comprehend?
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