Just learned this useful Xcode tip (works in Xcode 4.4+ I believe but I’m on Xcode 4.5.2):
If you shift+right-click on a view (or control+shift+left-click to simulate a shift+right-click) you will get a popup of all the views under the click and can choose any of them (to edit properties or what not).
This is especially useful with complex view hierarchies with multiple layers of nested views.
Here’s a screenshot showing you what it looks like. I shift+Right-clicked on a NSTableCellView embedded inside an NSTableView in an NSSplitView in a root NSView in an NSWindow. Navigating through the outline hierarchy would be slow but this is very quick.
Geek And Dad's Blog 
This is a good tip that I always forget about. It’s been in Xcode since at least 4.0.