I like the spirit of it. For me, what would most give a wiki lightweight, efficient user experience is in-place editing, like a word processor. It's so much more efficient - imagine the reverse, if Word required you to reload for every edit! In detail:

* In wikis I've used, editing requires 6 steps and 2 page reloads: 1) Find existing content/location on page (on pages that aren't tiny), decide what/how to edit. 2) Switch to edit mode (page reload, and lose my place). 3) Find existing content again. 4) Edit it. 5) Save (page reload, and lose my place). 6) Find new content and verify it.

* In-place editing, as imagined, would be 2.5 steps, no reloads (again, like a word processor): 1) Find existing content on page, decide what/how to edit. 2) Edit. 2a) Verify it.

The cumbersome nature of the current process consumes a lot of time (I'm a heavy user) and deters a lot of editing. I wouldn't even mind an 'in-place' mode change, where I didn't lose my place and didn't have to wait for a reload.

How difficult would that be? Does any wiki do it? I would be willing to help pay for its development, it would save so much time and also so much cognitive overhead.