I had two breakfast PS for my last trip Nov. 2003, one I needed and the other could've been a walkin. Both were during the week not on weekend. One was for 8:10 (needed PS for this time) and second was for 9:45 which could've been a walk in. The PS at 8:10 had 2 couples and a larger family waiting for seats at 8:00. Larger family had a member who was arguing with hostess as she was going to have to wait 5 or 10 minutes for them to clean and fix about 3 tables, she was making a big deal and finally the waitress told her off after explaining at least 2 different times the difference between a reservation and a PS. The woman was being a complete *itch and I was glad to see the hostess put her in place.
I would tell you to make a PS if your intention is to eat breakfast between 7:15 and 8:30 as there were a number of people heading off to enjoy parks for early morning hour. If you want to eat there on a weekend, make a ps.