Most of my notes are ephemeral, so I will just open the closest thing I can find and start writing. Sometimes that happens to be Sublime, other times I'll just open a comment block in the middle of my code (IntelliJ). I'll keep these notes just long enough for me to do what I needed to for them or move them elsewhere.
For more permanent notes, I really like Quiver. Its a nice balance between simplicity and ease of use, and I love that I can switch back-and-forth between blocks of code, markdown, and a richtext editor as many times as I need in a single note. I commonly write quick notes with the richtext editor, use markdown for authoring blog posts or other long-form writing, and both usually involve code snippets.
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