This. I hear a lot of whining about JIRA, which is fair since it's a huge pain to configure and learn all the quirks of, but usually it's overkill for those folks (perhaps myself included right now).

But the folks who have a working process and a large number of people and teams are usually complaining the other way round: that no tool supports their workflow. Which is where JIRA shines. I don't know another tool that can be configured to such ridiculous detail.

The Trello acquisition makes total sense because it fills in that gap that JIRA is bad at.