I've always secretly been annoyed by it. It's too inside, unnecessary, and it always takes me a second longer to figure out what anyone is talking about.
But don't stop doing it on my account. Just don't anyone ever ask a developer that worked on the game about a level and refer to it by those names. He or she won't be impressed. You might even receive a Nelson Muntz-style punch to the stomach, complete with finger point and laughter. I'm pretty sure Marty carries a shiv for just such a breach of etiquette.
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