It takes a certain desire to re-learn some things to get acquainted with MacOS X. Because the reason it feels different, is because you learned the Windows way of doing something, and the Apple way is different.
@Darqref, you mentioned slideshows and image imports. Did you by any chance use Powerpoint for Mac? That's the worst you can do
because it just behaves totally different.
Slideshows with iPhoto are a breeze, even better if you use Keynote (part of iWork).
And I too notice total confusion when I use both systems (Win/Mac) side-by-side. Once you concentrate only on one OS, you learn it pretty quick.
But, I don't believe in an Apple ebook reader. Maybe a device that can read ebooks too, but no dedicated device.