We've stayed at the GC three times, once with a pool view, once with a courtyard view, and another with standard view. While the view can be nice, whether it is worth it to you depends on how much you value the view (I know, duh) and how much time you plan spending in your room. While we value a view to some degree, we rarely spend a substantial amount of our time in the room looking outside (only go there for sleeping/napping). Thus, if it's available, we will take the standard view room and save the money (our upcoming trip is GC with a standard view).
I understand the go big or go home mentality--however, if staying at the GC means you can only afford (or only want to pay for) a standard view, I think you get a lot of value by being so close to the parks (especially for mid-day naps) and having the Resort Hotel Guests' DCA entrance so close.