Not a problem per se. I just like to only have the apps open if I'm using them. It's an OCD thing, I guess... 
But even if that wasn't an issue, if I'm working on a certain app and I want to just register an idea, I don't want to leave that app, go to Notes, click the Notes folder, create new Note, type in, go back to the original app.
I just want to hit the shortcut > type > click OK to save and close the window. Back to work! 
If this is not possible at all, then I will stick to that macro I shared:
The only thing that's bothering me a little bit is the one-line text field. Do you think there's a way to have a multiple line text area?