I think Babs is as integral as Dick is. I love how she can control everything with just a single word with the boys. There's a panel where Bruce shows up to see Babs' 'new toys' that is one of my favourites in the whole series.
Gotham Knights is one of the best series out there for showing how good the girls and boys of the bats fit in. The whole dynamic is fantastic and I miss it so much.