"One of the weakest areas of Google Earth is its layer interface. Mostly due to the fact that it is not easy to find layers without opening lots of folders. If Google would just add "search" to the layers pane things would get much better. An option to memorize certain favorite layer sets would be another improvement. There's so much information available in the layers, but my perception is that few people discover whats hidden there."Couldn't agree more.
I also worry that even when someone opens a layer, they may not realise that they have to fly down before anything will appear. I discuss this properly here.