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I do the exact same thing. Just a text file that these days I store in a Dropbox folder so that no matter what system I'm on I can just "vi ~/Dropbox/notes.txt".

Similarly, several years ago I added a keybind to my .vimrc that, by typing ",a" I'm moved to the bottom of the file and today's date with a separator line underneath. My leader key is "," and I mnemonically associate "a" with "append".

The earliest date recorded in it goes back to 2006 and is about 300KB in size. I still reference and add to it on a regular basis.