Keeping my notes in a single file has worked great for me too, i can quickly find notes by searching with Vim. i split the file in sections starting with [tag

Keeping my notes in a single file has worked great for me too, i can quickly find notes by searching with Vim. i split the file in sections starting with [tag<name>] (e.g. [tagvim]) which makes it easier to move between sections. Each section is a markdown list.