I'm occasionally there in the morning when the CCI shuttle is dropping people off. I stay at Majestic Gardens, and they share a drop off post, so they occasionally overlap with drop-offs and pick-ups. At any rate, I have yet to see a CCI shuttle that's filled to the brim with people. Pretty full? Yep. Full-full? Not that I have witnessed.
By contrast, Majestic is usually overly full and running busses at double time to try to manage their guests in the morning, haha. But Majestic is also ginormous in comparison to CCI.