When using the Zen plugin you can create pages with multiple page layouts in a single page. When you revert to the standard theme these are not lost - they continue to exist.
Make it possible to do this in the default editor. (See screenshot) If the section macro could be used the same way - wow!
Note: that both the editor and view screenshots are in the default theme - so all of this already works in Confluence. The only thing Zen did was insert the multi-page layouts in one page.