Thank you all for your thoughtful responses! We've been out of town for a week, so I hadn't been able to log back and in and reply until now.
I went ahead and booked a breakfast reservation at Garden Grill for our EPCOT day thanks to your advice. We're not big Pooh fans, and I think we'll be more pressed for time during our MK day than we will on our EPCOT day, so it's a good chance to take some time to sit and enjoy food and characters!