I use JIRA, Confluence, and BitBucket daily and I'm a big fan of all three. Yeah, there's some aspects of their products I don't like, but overall I'm very happy with Atlassian offerings.
I'm kind of got to be a Confluence Wiki Admin without prior notice and overall I would agree that they do a good job - but everything addon and macro related could get some clear and concise overhaul. I understand it's an ecosystem and there are lot's of clever and good ideas floating around but I'm never sure what can I use on my local confluence instance and what not... some documentation for newbie "idiot" developers is there.. and something for total professionals.. anything in between seems lacking. Luckily there is some stuff on bitbucket that you can analyse to get a grip on some ideas but it's neither intuitive nor easy.
TL;DR: Confluence besides their Cloud is kind of badly treated and documentation for modern and up to scratch immediate plugin development is mostly nonexistent.
So do I, and they're all tools that get the job done, but without any finesse or real care.
Bitbucket is inferior in every way go Github, with a UI that screams feature box ticking. Confluence is a place for documentation to go and die a slow death, and I'm still convinced Jira was entirely designed to keep project managers and mouse manufacturers in business - you can't do anything without fifteen clicks around the screen.
Give me Github, a repository full of markdown files, and Trello any day of the week.
TL;DR: Confluence besides their Cloud is kind of badly treated and documentation for modern and up to scratch immediate plugin development is mostly nonexistent.