Wikipedia visual editor
blog.wikimedia.org
blog.wikimedia.org
Homakov go!
Relatedly, making things too "easy to use" often obscures what's actually happening underneath and makes them harder to understand for certain classes of user (i.e. those that want to understand what they're actually doing).
There are better solutions than making something needlessly complex.
At our business we use Confluence. The earlier versions had a proprietary wiki syntax that us technical types found easy to use but the rest of the company did not.
Confluence added a visual editor and since then the quality of the non-technical documentation in Confluence has improved, because the ability to edit it is more accessible to the people that know the most about it.
There's a lot more to advanced editing than "learning simple patterns". Eliminating some of the trivial editing will free experienced editors for more important tasks.
Wikipedia is not about users ideas or opinions, it's about citing ideas and opinions from authoritative sources. This isn't 2003 any more.
There are many people out there, experts in their field, with valuable knowledge to contribute that may have a difficult time (or don't have the time/motivation for) learning how to properly format an article using the old editing system. I think the barrier to entry should be as low as possible to enable people like this to contribute as well. I don't really see why knowledge of a cryptic and proprietary text editing format should be used as a filter for people attempting to contribute information from fields that have no relation to it.