Agree with those who say don't use production data in development. It could possibly be useful when hunting down a nasty bug, but unless absolutely necessary I'd stay out of there. If you need to test something specific, especially new features, you probably end up adding your own data anyway, so why not do it right from start.
I can understand the attraction though, especially for projects that don't have proper tests. It's much easier to find by accident those pages that start loading slow or have tables that become unusable when populated with too much data and other similar issues. Especially those issues that may require adding a lot of fake data to find.
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We strive for transparency and don't collect excess data.