Thanks a lot for all your responses and links for further reading!
The problem is that in my current position (technically I'm just an
intern), I have no way of handing out motivators of any kind - let alone
making use mandatory. Even getting everyone to just enter their name and
position (to make them take a look at the wiki) is quite a challenge...
And the project leader wouldn't be willing to take any such steps before
he sees that the wiki is actually working - kind of a catch-22...
I will get the chance to make a (very brief) presentation though.
Obviously I'll have to make a good case for the wiki there (not one of
my best qualities) in order to get people to at least consider using it.
So as of now, I'm hoping for a "cascade effect" where a few eager
colleagues will pick it up, and then others might follow.
(I will of course be present to answer whatever questions might arise.)
As for a WYSIWYG interface, I'd agree that while this might erase the
intial obstacle, its (current?) limitations would likely lead to
frustration further down the line.
I'd consider WYSIWYG if advanced users could just turn it off, but it
seems that all available solutions/extensions change the way contents
are saved, creating an either/or situation. (This might also lead to
complications when trying to export contents from the wiki for use in
some other medium!?)
Thanks again for you kind and truly helpful contributions!