I nominate Advanced Slides by @MSzturc
Developing presentations based on my notes make my notes better.
Translating a topic into a presentation helps me to find a common thread across the topic. It changes the structure of the notes, because using them and integrating them means that I cut my notes even in smaller pieces and make them more precisely and thus come closer to the core of the message i want to transfer
With this plugin all of this is now possible without leaving Obsidian. Much more, my presentations are now hubs in my graphs that feel more natural than MOCs, they connect knowledge and represent structured paths through my notes graph.
This plugin has changed the way I work with my notes.