Completely changed how I think about writing. Obsidian plays the role of an extensible IDE and framework which you can configure to work however you want. It is the single most important tool I use day-to-day.
Obsidian is by far the most valuable product I interact with on a day-to-day. I've been using it since the beginning and the evolution of the community and product is so beautiful. Obsidian is quite literately my second brain until I die.