And although educational dedicated areas are important, kids couldn't care less and would rather see all the animals themselves. Combined with the fact Sydney's easier to get around for families, it's obviously slowly becoming the better destination to visit (especially with young families).
When i did my undergrad degree, we had to study the impacts of different types of education for conservation. Seeing/interacting with an animal is by far the highest impact. People like nicely designed exhibits with information to read, but that comes secondary to actually seeing and interacting with the animals.
Sydney zoo does this quite well, they have a lot of visible animals, with enough info to get the message across. Taronga is wasting space on fake aeroplanes, villages etc that people walk past. At the expense of actually having animals.
The same with the camel exhibit, camels were a lazy use of the space and were a prime example of the animal management the zoo has. Now its become a non animal human area on part of the flattest part of the zoo, with the most application for any type of exhibit design.