Very much so. In fact Bush was built specifically to create a winter destination within the Zoo, and included a large restaurant for that purpose. It succeeded beyond expectations, and resulted in a massive increase in visitation. Many of these visitors never visit other parts of the zoo.
Why would someone visit only one part of a zoo? Except for local & very regular visitors, this makes no sense. I've been more than 30 times to this fantastic zoo, on many occasions with lot's of other people, and I never restricted my visit to the Bush (or to the eco displays in general) alone, neither did any of my fellow visitors.