One of my concerns are visibility of data – variables. And this is one of the areas where we can take advantage of our graphic nature. As we display a diagra we can also show all variables available to that diagram at a simple tree-list at left (or right). We can also present tools to manipulate variables as well as descriptions.
I spend so much time going forth and back between screens looking at variable names, description etc – so this is one of the areas I believe a graphic language can do better. That said – this could also be done even on C or C++.