I use notepad++ in the same way without guilt, I also have a paper notebook where I write things in the same random chaos. In the past I had at a time a LG monitor that had really large bezels and I used to glue post its to it all the time as my "temporary" notes.

Most of note taking applications I tried attempt to convince all my text is important and must be stored and if possible classified and that's just not how my relationship with physical notes is.