I found a very specific use out of the blue of Lambda functions that I have now used and I see as a great use-case. Which is specifically passing functions/logic from your Controller to your View. In the case of Goodsie, I'm using PHP for my templating language and as usual I'm trying to remove as much logic from my View as possible, while still allowing the view to be malleable.
His method centered around a pagination subview that he wanted to make flexible enough to work with both the standard page view and with an ajax request. Lambda functions came to the rescue by dynamically creating a function based on the request need.