You can also trivially come across data designed for consumption with AWK. Whenever I write a script or utility to dump some data for later analysis, I take into consideration if I can shape the output in a way that will make it easy to work with in AWK.

Because I won't know ahead of time what all the interesting values or summaries will be, but if I know I can get it through AWK it will be cheap to extract or compute those values and summaries later, once I know what they are.