I have only been to WDW once since I was an adult. I have to say that the Biergarten is one of my favorite memories of the trip. I am not the type of person who likes to sit with other parties at my table but Biergarten is different... Hello... it's called Disney Spirit right? I am the type of person that says "Happy Birthday!" to kids in the park who wear the birthday badges so maybe I'm a bit crazy but this place is cool. The band and the beer make this my absolute favorite resteraunt in the WDW.
Just want to throw in that I never go for the food (although it is totally edible... some is really good too!) I go for the atmosphere. I think if you are the type of person who can enjoy a good time for that alone and not expect an outstanding meal then the BG will rock your world... just as it does mine :-)