We have eaten at Rose & Crown several times and enjoyed it, but we have not been for a few years. The menu has changed since we last went. We found the servers to be warm and friendly. Lots of folks will tell you to get a patio table for Illuminations, but they no longer allow you to request and wait for outside seating. It is totally the "Luck of the Draw" when you check in. It is a wonderful view if you get it. The best time for an ADR, hoping for Illuninations seating on the Patio would be 7:30 - 7:45. If you are seated inside, there is a private patio you will be escorted to to watch Illuminations - it is still a good view.
That said, I see you have some young children. There is no special entertainment for them at the R & C.
However, we were very disappointed in the Biergarten on our trip in October. We waited for 45 minutes to be seated in a half empty restaurant. I was not pleased with the buffet at all. All I really enjoyed was the desserts. The entertainment was enjoyable, but very short in duration.
Good Luck in your decision