Section editing is certainly counterintuitive for most, especially for sections more than a paragraph or two long—I invariably edit a section after I've read it, meaning I have to scroll/page back up for the link, and I remember it taking a while for me to get used to this. What's more, the link actually comes before the section heading, so only a graphical, CSS-enabled browser will display it in anything approaching a reasonable way.
Although this thread was spawned by the one on site design, MediaWiki usability really isn't an issue for foundation-l. I'm sure it's of interest to many here, however, and perhaps it'll result in more widespread interest in improving it.
Austin