Many of you are still using the old "Component View" but the "Page Designer" introduced in APEX 5 made the developer life much easier.
The top 5 most time saving abilities for me are:
1. Easy access on all page elements (without any page refresh)
2. Copy&Paste of items, regions, dynamic actions, ...
3. Drag&Drop moving of items and regions
4. Multi edit of items
5. Since APEX 5.1: The ability to customize your own personal Page Designer View