NOOOOOOOOOOOOOOOOO!!! Don't go over to the dark side!!!!!
You are a Jedi of the command line - Wizard of the script - Oracle of code. Do not succumb to the glitz and glitter of the GUI dark side! For all they offer is vain. Once enticed you will only then learn of the shallowness of the dark side. It is a mere facade that will prove weak and easily overtaxed with all but the meagerest of demands upon it.
Kevin, IMNeverSHO, is right. If you can "do" R, you should look to VBA. With VBA you will be able to take from the dark side it's meager offerings of GUI goodness and yet resist the temptation to do GUI gymnastics when CodeFu will get you there via a more elegant path.
We, brothers of the code, are here for you. We have behind us the knowledge of many before us. The knowledge upon which the GUI generation is dependent. GUIs shall always stand upon the ground made solid by our brethren. We, keepers of Ada, custodians of Lisp, clerics of C, protectors of Perl too have our young generation of warriors. We too enter the future with youth and vigor, but such as ours is built on code and shall protect the earth through Ruby and Python. Have faith in your ancestors urlwolf. Our strength runs deep throughout the universe.