When working in views with lots of subcategories, there is no way to be able to scroll quickly only through the categories. You need to expand each main category, then each nested sub-category
Using [ExpandAll] makes all documents and responses visible, which makes the global view impossible.
This way, you can see a summary of the data in one glance, especially if you've got some total columns. Imagine for example a sales view categorised by year, month and week, and you can export it to excel in a few seconds.