An analogy for MediaWiki can be made to the world of cooking as follows:
The various software applications used by an organization can be compared to a large set of specialty knives that one might find in the kitchen, each one being specifically designed for a specific task: slicing vegetables, cutting meat, cutting bread, filleting fish, etc. Because the aim of the knife manufacturers is to develop each type of knife for a very specific well-defined purpose, its overall flexibility to be used for other tasks is often not the goal; but at least you know, right out of the box, exactly which knife should be used for which task.
However many experienced cooks and chefs will eventually settle on just "one good knife" for almost everything they do, because once they've gotten used to it, the "one good knife" can do almost everything they need.
Enterprise MediaWiki is to knowledge workers what the "one good knife" is to the experienced chef.
Once you understand how it works, you can do most things with it.