We loved the Biergarten! We too are a family of three, and sat with another family of 4 or 5. They had already started to eat, when we sat down. Honestly, it was so loud where we were sitting, we said hello and smiled, and that was about all the interaction with the other group. Plus, there was enough room between the two parties you didn't really feel like you were on top one another. I found it comfortable.
Go, enjoy and tell your wife to let her hair down and enjoy the meal
kidding 
Go, enjoy and tell your wife to let her hair down and enjoy the meal

