What I understand you're saying is that the keyboard shortcuts may typically be more efficient to perform in Windows. That could be true but it's a different topic from discoverability, where straight up full text search is better than collision hampered and segmented expansion of menus.
Beyond the basics (cut/copy/paste/new/save/quit/...), there's a fair chance we don't know which sub-menu the function we're searching for resides in (and shouldn't have to care).
...good point, the point I was trying to make was not so much the discoverability of the FEATURE (I do agree with your points there)...but of discoverability of the SHORTCUT to the feature, which is what you referred to as efficiency.
the fact that I (and apparently many others) learned about some OS X keyboard shortcuts through reading this thread indicates that there is still a problem with "discoverability"
Beyond the basics (cut/copy/paste/new/save/quit/...), there's a fair chance we don't know which sub-menu the function we're searching for resides in (and shouldn't have to care).