My top 5 is:

• Linter: To automatize the formating of my notes
• Text Snippets: For creating text-based triggers to things like Callouts
• Commander: To customize wich buttons do what in my ribbons and button panels
• Recent files: So I can have a small history of navigation available when needed.
• Note Refactor: To easily separate a big chuncky note into smaller ones (divide, union, auto-add backlinks, etc.)