Yeah touchwiz is really a direct copy of IOS, pretty much everyone will agree to that, even the android/GS 2/touchwiz fanboys
The only thing that really sets them apart is the widgets on the homescreens
It is more pure stock android that I have troubles with seeing similar stuff to IOS, but I can see what you mean now for some of the stuff, but they are very minor things really.
But as you said, you can't really do completely different ideas like the app drawer icons unless you copy microsoft window mobiles app drawer layout
and for the indicators as to what page you are on, yeah true that, but again there really is very little ways of doing something completely different that would look as good or be as handy as the current method although I have them turned off and just use pinch to zoom to bring all screen previews up.
Certain things like those mentioned are pretty much on every OS and everything e.g. camera is similar layout with your take pic button etc.
But when you look at both IOS and ICS overall, they really vastly look completely different but take the stock GS 2 and IOS and they overall look very similar.