Read up on
Fitt's Law then you will understand why the menubar in Mac OS X is the way it is.
Apple is a design company and most of their design decisions, whether in software or hardware, are for a reason (not just-because).
It is fascinating after all these years yet people (mostly clueless users coming from where the sun doesn't shine...aka Windows) still continue harping on the Mac's menubar.
As cited before by someone else, let me paraphrase, "Apple didn't use Fitts' law for the dock"
Also, they may have used Fitts' law for the menu bar, but as far as I can tell, the law only describes the size and placing of a button to make it easy to press - the Apple Logo for example, it still executes even if you throw your mouse to the corner of the screen (well, unless you use the corner thing where it makes it do something (eg. Screensaver), in which case that doesn't work. The law does not then describe the time it takes to find something, from the drop down list, which I would theorise would be considerably longer than controlling your mouse to a dropdown/button in the grey bar.
Just because Apple designed it doesn't make it the epitome of design, Microsoft products are often great and well designed too.
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You're comparing TextEdit to Word. Absurd. Try again, with Pages this time.
Also, comparing iOS to OS X is far from being valid. It's a page based OS rather than a window based OS. And the so-called dock is only a row of icons that don't move. It doesn't have a tenth of the functionnality of the real Dock. You can access the dock anytime on OS X, but only while on the Springboard on iOS.
In Pages, you have to use the font button, sensible, however it still brings up another box, which is unnecessary and clutters up the screen more, covering work, and requiring an extra click, and taking more time - this button, which is in an Apple (a design company) product also breaks Fitts' Law.
And the point is valid, I'm sure Apple, with 10.7, will bring alot of design elements from iPad/iOS to OS X, like the whiter UI, compared to grey, as a simple example (would be a relief, so much grey). Also, in iOS, they could have implemented the menu bar to have File, Edit etc, instead of the icons, they didn't, they went for the icon approach.
Also, the multitasking thing? I don't get it to be honest, if I want to play the next track in iTunes, or Spotify, I 'right click' the icon on the dock, which seems simpler..