We make our own beer and pour the must (stuff that's filtered out after fermenting) on the lawn. I've never really seen it have any affect. We also pour earthworm castings all over everywhere so it's already well fertilized.
Maybe I just don't see a difference because of the amount of other fertilizer it gets.
Also I've never poured beer on my bananas. If it were ever to get close to getting old... Well, I guess I'd just have to throw a "We Have Surplus Beer" party. It's hard enough to keep a supply for our friends. I couldn't imagine brewing some for my plants. Although the most intelligent intoxicated conversations I've ever had were with my plants. Go figure.
