We just returned from the Grand Californian and had a fantastic 5 night stay. I had booked a standard view room through Costco travel and asked at check-in if we could get a better view. Our check-in cast member was more than happy to show us a few options (pool view, park view, downtown Disney view) and upgraded us at no charge. Originally they had us booked in a room with a view of the construction at the very end of the hotel.
We ended up with a spectacular view of DCA on the 3rd floor and had easy access to the 'secret' stairs to downtown disney (about 2 minutes from the main gates)
So basically what I'm saying is that it can't hurt to ask for a better view even though you paid for a standard view. You are already paying a fortune for the room - why not ask?
They are there to help and make your visit a magical experience.
Have a great trip,
Scott