First time I ever heard something positive about confluence. (But I only heard about it, because we use it at work and people like to complain about it.)
To me its waaaay better than Sharepoint - which we also used. And it is way more suitable for "non-technical" and "non-wikisavvy" users than e.g. MediaWiki.
One minor misgiving about Confluence is its syntax: Opening and closing tags look the same. So {noformat} both starts and ends its environment. I haven't done anything fancy myself with Confluence, so I can't comment on the other complaints. (And we do use an ancient version, because we have some custom changes, and nobody has found the time to port them to the new version.)