Most don't have decent tooling set up for such a thing. Org-mode has a great feature where you can quickly capture todo items along with the place you were when you made them etc. (file/project, for example). I could be writing a function and get a thought about some upstream calling code, press a key, make a note, forget about it and carry on coding, knowing that it made it on to my todo list for investigation later.

If I had to switch to some other note taking platform it would probably break my flow enough that I wouldn't do it.