> When your bread and butter is crunching through large amounts of data with MapReduce, it only makes sense that you tend to take a more functional approach and think in terms of single-operation mapping, filtering, folding, and sorting.

Umm, sorry, no. You wouldn't believe what kind of 5-level-nested-if C++ statements you could find in Google's codebase. Google might be known for its technical abilities, but "affinity to functional programming ideas" is generally not one of them.