Phyared, this is a real issue, whether you choose to belive it or not.
Just because you are unable to understand how someone can get dizzy and nauseous from screen animations does not mean it doesn't exist. Read through the 100 replies here. Read through the 100 replies on other forums. Do some google research on types of motion sickness. This is a not a conspiracy, these are real people sharing their real experiences.
As you mentioned, the animations seem inconsistent, which is one of the main reasons this IOS 7 causes issues that weren't problems in IOS 6. In IOS 6, the app animations always originated in the center of the screen.
In IOS 7, as you've noted, the animations originate from different sides of the screen depending on where the app icon is located. This combined with the speed and type of animation causes many of us to experience very similar nausea-type symptons, as you can see in all the replies.
I have similar issues with first person shooter video games like Halo or Call of Duty, even if it's on a small computer screen, when I am in full control and even when only playing for a few minutes. I think most people understand that some of these FPS video games cause problems for a portion of the population. It is well documented as well, you can do a google search if interested to learn more.
On my iPhone5, even though it only has a 4" screen, I hold it 8-12 inches away when reading, so it takes up a considerable amount of my effective field of view. So when the apps zoom by me as if I'm entering a tunnel, and then zoom out as if I'm reversing out of the tunnel, it causes feelings of motion sickness and dizzyness. If you are not subject to motion sickness, this may seem completely riduculous. But it is real and affects a portion of the users.
We are not a bunch of whiners, as many commenters are saying, looking for any reason to complain or give bad press to Apple. If we wanted to give bad press, we would all say that our iPhones are catching on fire and exploding! Let me go on the record and say that I like my iPhone 5 and have no desire to switch to an alternative. And I like the upgrade to IOS 7.
The only issue is the animations and motion sickness many of us are feeling. This can be fixed by Apple allowing an option to DISABLE the animation. That's all we're asking for.