We are in the minority. We did not enjoy the food at Kona Cafe (either breakfast or dinner).
I don't know that cook's breakfast is better, taste-wise, as we didn't have breakfast, but I wouldn't pay the prices again for Kona.
If I were to have a sit down breakfast again staying at Poly, I'd go over to grand Floridian to the cafe, I thought the breakfast there was delicious.
Also, while not breakfast-related, the pulled pork tacos at trader sam's are really good, if you will be going there and want something to nosh on. You get three.