If it were just a few minor tweaks, I really wouldn't care too much. When its a complete overhaul to the OS of the phone that I have with many great new features, you bet I want it! What if you bought a Dell laptop and couldn't get Windows 7 because Dell doesn't feel like rendering a version for your computer and you were stuck with Vista. Meanwhile the new Toshiba machines are already updated and running 7. How long would consumers put up with that? Not long, I can assure you. So why do we put up with it on Android? If Samsung doesn't update the Galaxy S2 with ICS in a timely manner, like within the next month or so, I will probably sell it and leave Android. Not doing this a 4th time in a few years, its ridiculous.
Under the Windows scenario, you pay for a license to get from Vista to Windows 7.
People without issues don't care, and just replacing the whole shebang to get a fully working lap or desktop is a very popular move. Consumers are standing for it quite nicely.
My first Android got updated from 1.6 to 2.1; my second from 2.1 to 2.3; my third from 2.2 to 2.3; my fourth started with 2.3 and will get 4.x soon - and the last three, covering about two years, have had steady incremental updates.
Unlike the Windows scenario, I still have the last 3 models, they work great, and I didn't spend a dime on license upgrades.
iOS updates may be free, but OS X updates are not.
How many iPhone models are currently supported? Three, and last year when it was two, one of the updates put a lot of iP3gs owners at a crawl with unusable phones until that was fixed.
How many Android makers? How many models to update? It takes time. Even if you have the non-GSM non-developer Nexus or an older Nexus.
If you prefer how Apple manages things, fine, but it's not all sunshine and roses for either side. A number of iOS 5 new features are really great, I had them in Android 1.6.
So, there are updates and then again, there are upgrades.
Personally, I am glad that iPhone owners are finally enjoying features I've really liked for two years now.
PS - the iPhone has some features we don't yet. Alert the media, no phone is perfect. Seriously, alert the media, they don't get it and help set false expectations.