I did this at our 8/22 BOG breakfast. I just wanted straight-up, plain ol' bacon & eggs, and the only way to get that was off the kids menu. Between that, the accompanying fruit dish and the pastries, it was more than enough.
DW had the open-faced bacon & egg sandwich and she really enjoyed it. She said the poached eggs were perfect. We both agreed that BOG was a nice intermediate step between the standard QS breakfast and a buffet. Between the early entry, beautifully relaxed walk down an empty Main Street, the breakfast itself and the early 7DMT rides*, we thought it was worth it and would do it again.
*--Yes, we know it's not guaranteed and we weren't counting on it. Even if we hadn't been able to do 7DMT, we still would've enjoyed the overall experience very much.