I'm surprised to read this. Confluence is the most unpleasant "wiki" product (its lack of support for redlinks prevents me from really considering it a wiki) I have ever used. Its built-in hierarchical structure for pages is excessively intrusive and undercooked at the same time, and the search is so bad that I have had it fail to pull up pages when I typed in the literal, complete title.

Like most Atlassian products, its only apparent notable quality to me is that it integrates with other Atlassian products, as well as being a semi-functional platform on which to pile plugins and customization. It's possible that there's a good Confluence install out there, probably administered by the same people who run that really nice JIRA instance that people claim to have used once.