GET THERE EARLY!!! When we went in 2008, they were letting people into Mickey's Backyard BBQ at least 30 minutes before the start time on the reservation. So, you can get in early and have some drinks/food sooner.
All the seats are the same really. Unless it has changed since 2008, there's a band stand (country band) and a big dance floor in front of that. There's several tables all around that are like the ones we had in high school -- long tables with built in benches on wheels in rows. During the BBQ, people are always up and moving to get food, to get a drink, to go dance, etc.. Your "view" really doesn't matter.
There was someone who did rope tricks... all the children sat up by that. After that the band played and everyone could dance with the characters. Some of the characters roamed around for pictures (don't expect a lot of autographs, or any...) or they were just running from backstage to the dance floor. Dancing was mostly freestyle with a few of those group line dance things (that I never get right!).
Food was Ok..... nice that beer and wine was included for the adults, and all you can eat ice cream for the kids! Lots of dancing and fun. But nothing fancy... it's a BBQ.......