Yeah -- I hear ya. Apple, however, has not. In fact, upgrades have made moving Projects ever more difficult. (We lost the ability to drag-and-drop between the Inspector and the Inspector HUD, and double-clicking a Project in Project View no longer selects that Project in the Library Inspector.) I have no idea why the Aperture designers have made the program less flexible. Please send them some feedback via "Aperture➞Provide Aperture Feedback".
The only way to put Projects in Folders in to select and move the Project in the Library Inspector.
A few small hints may help:
- In Project View (what you describe above), click the "i" icon at the bottom right of the Project square, then click "Go to Project". This will select that Project in the Library Inspector.
- Create a top-level Folder called something like "__My Top-level Folder" (the underscores will force it to the top when an alpha sort is applied). Then use two steps to move Projects: move them to the top-level Folder, collapse the Projects section (or parts of it) and then open Folders so you can see the target Folder, and then move the Project to the target.
- If you are re-organizing your entire Library, make two new Folders called "My Old Library", and "My New Library". Put your entire Projects structure in "My Old Library". Now you can select a Project or Projects, and drag-and-drop them to "My New Library". Collapse "My New Library", and it will "spring open" when you hover over it while in the middle of a drag-and-drop operation.
- To collapse or expand everything to the level of any disclosure triangle, "{Option}+click" the triangle. The same holds true for the section controls "Show" and "Hide"