OTOH, I found adding properties and methods using the text editor to be much quicker than the clicking/tabbing around in a dialog box which is the way it's done

OTOH, I found adding properties and methods using the text editor to be much quicker than the clicking/tabbing around in a dialog box which is the way it's done in UML editors I've used. So I don't know what the right balance is. What killed it for me, for UML, is that the properties and methods don't have their own connector points for attaching an arrow to.