I understood what you said.
The button are what's called a sectioning facility implemented in the core of dokuwiki.
You see only a part but when saving but you modify the whole page.
If you are an HTML savy, you can see that there is a prefix for the part before and a suffix for the part after.
Reorganizing the outline is normally part of a rich text editor
Dokuwiki has en editor based on a form where your manipulate the text file directly. This is not really called a rich text editor but a text editor.
I need sometimes to move section around and I agree with you that this is a pain.