I think the company culture will be the determining factor. If you have a number of people trying actively to be as knowledgeable as you are, and documentation

I think the company culture will be the determining factor. If you have a number of people trying actively to be as knowledgeable as you are, and documentation is considered critical for everyone, a wiki will be the right approach. If most managers think that people should have strongly separate knowledge domains ("you should be the specialist of XXXX" in our company) and/or strongly value face to face communication, a wiki won't save you from getting drowned into questions and requests. To take the not so good example, in some companies telling your boss you're reading docs related to a library will get you a "why don't you go talk to TheKnowledgeablePerson instead, he worked with a version of it 10 years ago, he might remember things, perhaps"