And this is my point...if lagering beer was a total waste of time, no one would do it.
The process of lagering might seem somewhat passive, but it helps to mature the beer. There are a couple of different fermentation by-products that can be reduced by yeast during this step. The most common are acetaldehyde, which tastes like green apples, fresh pumpkin, or latex paint, and is diacetyl, which contributes a buttery or butterscotch flavor and aroma. Both chemicals can be reduced by contact with yeast, and lagering gives the yeast cells some more time to do their job.
Anheuser-Busch’s famous beechwood aging is designed to increase the contact area between the yeast and the beer. They start with long chunks of beechwood, which they treat with baking soda to reduce the already mild flavor contribution of the wood. A-B stacks these pieces in the Budweiser lagering tanks, and then they kräusen the beer by adding fresh wort. The wood forms a substrate to collect yeast, increasing the yeast/beer interface, as compared to a thicker layer of yeast at the bottom of the tank.
The brewers at the major brewing companies must be a bunch of idiots, stuck in a time warp, and somehow thinking aging beer actually accomplishes beneficial effects.
Let me say again...it's your beer, you made it, you drink it when you like. That's what we do!