I'll let Rebecca tell you about dinner at 'Ohana, other than to say it's excellent and I'd go back anytime. Haven't done the breakfast, but I looked in once and everyone seemed to be having a great time and the reviews all seem to be positive.
However, the topic here is getaway day breakfast at the Poly. I have two suggestions:
First, think about breakfast at Kona Cafe. My wife liked the Tonga Toast (sourdough french toast with a banana stuffed into the bread), my omelet was excellent, and Emily loved her pancakes. No pressure, no hurry, we just wandered over to the GCH, waited ten minutes to be seated, ate, went back to the room, changed, took a quick dip in the pool, went back up to dry, change, and pack, and went home. It was great.
Second, try the Wilderness Lodge. We took a cab over, explored for a while (it's pretty cool), had a nice breakfast at Whispering Canyon Cafe, then took the boat from WL to the MK, walked over to the next pier, and got on the boat that goes from MK to GF to the Poly. Very pleasant.
Just thought I'd share what we enjoyed on our Poly getaway days.
Good luck!
Kevin