VS Macro / Shortcuts to Expand / Collapse all regions

CTRL+M CTRL+M (that's two key presses!) - Collapse / Open the current parent region

CTRL+M CTRL+L - Collapse / Open all regions in document recursively (meaning you might get only one line in the document - one big namespace region which is collapsed or you'll see the entire page code uncollapsed)

CTRL+M CTRL+O - Collapse all regions not recursively.