Give Google docs an outline view similar to MS Word.

I prefer google docs to MS Word for collaborative development of documents, but I can only see one section of the document I'm working on. This is very frustrating.

I would like to open multiple small sections of the document by expanding sections of an outline. Often I need to refer to multiple related sections in order to ensure they support each other and are not redundant.

The google docs format button already provides 3 levels of heading formats.
Why not provide an outline view similar to MS Word with +/- signs (or other method) for expanding/contracting outline sections at each header.

It would really help me be more productive if I were able to view the entire document at a high level and expand only the sections I wish to work on.

I love google docs! Thank you!