You just reminded me of a great feature that I think I first noticed in The Gimp: you don't have to search through the list of file types when exporting (I almost typed "saving"!), just type the extension in the file name and it'll save in that format! Love that part.

It's when I want to close the image or the application - the extra click to confirm that, yes, I am aware this image was not "saved" and that I could be losing data. I admit I have not looked into whether I can disable that extra notification.