Just a quick first hand experience - I took the cable car today around 2pm to start a hike at Ngong Ping. There was absolutely no queue to buy tickets, and less than 5 minutes wait to get on a car. Peopel were being loaded 4-6 to a cabin - well below their full load, but nice from the point of view of moving around, taking pictures, etc. It was a beautiful day, and it's the school holidays here, so maybe it really is only at peak times like CNY that it is very busy. It is, presumably, also a bit busier at weekends.