Like many of you, I have built up a lot of workflow around my email. I'm on several dozen Fedora mailing lists, so I heavily filter my inbox. In fact, that's one of the areas where I'm least enthusiastic about a large-scale move to Fedora Discussion. Our tag-based setup makes it very difficult for Gmail (as an email client specifically) to filter alerts the way I want.
On the other hand, as someone who often needs to cross-post announcements and the like, the experience for that on Discussion is so much better. And there are a lot of other quality of life improvements, some big and some small, but they add up:
* The ability to move threads from "contributor" to "developer" areas and vice versa * Splitting off tangents to a new thread * Editing posts (with visible history, of course) * In-post polls * In-line date/time tags that can render the time in the user's zone
Discussion isn't perfect, but it's better on the whole than I thought it would be.