I like Confluence, I hate some pre/styled things they do, but in general is not a bad wiki software and it's integrated with Jira. The worst is no one at my company reads these docs :)
I administer my company's internal Confluence server and author most of the content, and I have a few complaints but overall I love using it. What do you dislike about it?
My 2¢: Confluence's primary job is to share and manage lots of written documentation. If I wanted to make such software I'd make it fast, the curation/management job lightweight and inline, and emphasize readability and promote fast comprehension of information with layout and design.
Confluence is slow, curation/management is ponderous and the design ignores hundreds of years of research / practice in visual processing of information.
For Confluence: we've found a much better alternative is Quip - we all love it after the switch. Dropbox Paper is another new alternative that people seem to like.