Fitt's law[0] says difficulty of movement is a function of both accuracy and distance. Macintosh-style menu bars reduce the accuracy required but increase the distance. When distances were always small, this was a clear win. Now that we have large wide-screen monitors, it may not be.
The real correct solution is pie menus[1], which reduce both accuracy and distance requirements regardless of screen size. Blender has pie menus and it's one of the reasons its UI is so fast to use once you've learned it.
