Have used it in one screenplay (heavily too, but this was a very specific request) and once in a pilot. Both were neo-noir ideas and were conscious borrows from the genre's use of the technique for two different reasons. One for comic effect, the other was traditional but with our own twist.
I loved the technique when I first started writing but now tend to shy away from it. The industry goes in cycles. Sometimes VO is in, other times it's out. Sometimes, when handled well, it is stunningly good - Sin City. Other times it feels like an intrusion.