After Effects Folders in the Timeline

Wouldn't it be great when Compositions with massive numbers of Layers could be organised in Layer Folders (a bit like Photoshop can do).

These Folders are different from PreComps:
1-the folders are foldable/unfoldable to give access at any moment, without leaving the Composition
2-the Layers withing the Folders act like normal Layers, and can have different compositing modes to influence all Layers underneath.
3-Layers inside and outside the Folder can refer to eachother (Set Matte, Parenting, Expressions, ...)