Math land v.s. CS land

I came across this article on an NLP blog (http://nlpers.blogspot.com/2010/01/arxiv-and-nlp-ml-and-computer-science.html) that made a humorous comparison of publishing a paper in the 'math land' and in the 'CS land':
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The following is a cartoon view of how (some branches of) math research gets published:

1. Authors write a paper
2. Authors submit paper to a journal
3. Authors simultaneously post paper on arxiv
4. Journal publishes (or doesn't publish) paper

We can contrast this with how life goes in CS land:

1. Conference announces deadline
2. One day before deadline, authors write a paper
3. Conference publishes (or rejects) paper

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For Operations Research, I would say from my observation that it lies on the convex combination of the Math land and the CS land in this perspective, with considerably more weight on the Math side.