Last night I synced my iPad and allowed iTunes to update the software by accident, wanting only to sync mp3's with my PC. The device had not been updated for months, to avoid one of the early updates that repurposed the rotation lock switch into a volume control. Apparently no one at Apple thought people read lying on their side, or they enjoyed reading text that is always perpendicular to the floor.
I was pleasantly surprised to find the rotation lock switch restored, how many updates ago, I couldn't say. Interestingly enough, one of the most cool little user experience features I've ever seen has been removed. I called it the "Virtual Bezel", a thin black frame displaying nothing but time and status indicators atop the display. When you rotated the iPad, this Virtual Bezel would quickly follow that motion with a smoothly rotating animation. About another half second later, the rest of the iPad display would appear in the new orientation. I thought this was a brilliant trick, giving the user immediate feedback, which on a sub-display maybe a mere 10-15 pixels across, was really fast. Reconfiguring the other 95% of the display, and associated rendering hardware and software pipeline and its memory buffers can take a perceptible amount of time, as seen on Android devices. The latest software update features the entire display smoothly rotating as you turn the iPad, albeit ever so slightly slower than the Virtual Bezel did. I suspect there has always been hardware acceleration available to pull this off, but maybe the code was not ready for iPad launch.
Other rotation accelerometer enabled devices, like Android phones, do not have this Virtual Bezel, so when the user rotates the screen, the wait for action seems to take forever before the screen pops into place.
As Android devices get faster processors, the brute force display system tear down and reconfiguration for rotation orientation will become less noticeable, but device builders will still suffer in terms of perceived user experience. Even with a faster processor, users may consider a given device to be less responsive than another running a slower processor if it's got a smart user experience trick up it's sleeve. This kind of thing takes planning and dedication of resources, something that follow on device makers would have been hard pressed to fit in to their first build schedules, given Cupertino's first mover advantage.
Many believe that Apple has Buzz, some aura of the wonderful acquired through brilliant marketing campaigns. Sure, marketing helps to get a product noticed, but when users pick up a device and play with it, it's these little intuitive, almost subconscious connections heavily weight purchase decisions. Do this year over year, and yes, there is a magical quality that has people hanging on their every word and deed. To tip the scales in their direction, Android device makers will have to reach beyond a few customizations of the Google template and forge their own unique Virtual Bezel like UX innovations.