I’m looking at MeVisLab’s interface for generating views of data and I find that that way of viewing control structures is extremely intuitive.

It is especially the connected boxes I’m liking, is there any kind of framework that supplies this sort of interface. I know it can be done using Qt but beleave it takes ALOT of work.
Does anyone know of frameworks for making this type of gui?
This is not c++, but i think it covers your problem, so i would suggest WireIt.
Examples:
It is a Java Script library, so the browser would be your GUI. But i really think, that using the browser is a good thing to do. Learning HTML, CSS and Java Script is about as difficult as learning a new GUI framework. You could concentrate on HTML5 and ignore old browsers and maybe use a nice lib like jQuery, which is like the boost of js. Even if your GUI would only work on Firefox you would still support more platforms than most GUI-Toolkits.
You would of course have to embed a small http-server in your c++ code, you could use libmicrohttpd or mongoose for that.
In the end you have used tools that are very reusable and will have a broader applicability than GUI Frameworks.