He means having one home button is easier than having 3. Plus iOS allows you to swipe to go back. Buttons on top are a pain in the ass on bigger Android handsets.
You can use iTunes over wifi. There are lots of file managers in AppStore, but iTunes is so easy to use. For single files, like one photo or one ebook, you can try DeskConnect. You just drag a file in the computer to the program icon and it goes to your iphone. It's that simple.