I wouldn't call it "dead easy", no. Dead easy is pressing a load or open button and selecting the file I want to open. Like, you know, we've been doing on computers for about 20 years, in part thanks to Apple.
I agree that dropbox and sugarsync are lifesavers, but they shouldn't be needed to transfer a file from one app to another on the same iPad. That's a workaround for a missing, and essential, functionality, not a satisfying solution. Besides, they only work with apps that have been built to integrate with them.