I think it may depend on what time of year. I was just down there 10/18 thru 10/23 and the resort was only at a little over 50% occupancy. We didn't need to make ADR's. Did breakfast and dinner at Shutter's a couple times.
ENJOY!!!
I'd suggest that if you know you want to attend the character breakfast (sat) or the brunch on sunday - you make ressies for those. "Locals" often come to these in addition to resort guests. Otherwise you should be fine.