Since Windows Vista, typing what you need at the start screen is a much better way of getting what you want than digging through folders. Also, the concept of Libraries was meant to minimize the need for folders. I'm pretty sure most users now either use search or the jump lists to access the files and programs they want than to remember which folder they stored that particular file in.
Also, phones aren't PC's and shouldn't bring the complexity, security threats, and inconsistency of that environment. If you're an Android user, I apologize, I'm not intentionally targeting your platform again.
edit: gcubed, Google integration in terms of Calendar, Mail, and Contact support was surprisingly solid from the outset of Windows Phone. I really hope they continue to add hooks and improve on the Google integration since I'm a gmail/chrome/google calendar user, but I really can't say it was difficult going from Android to WP. In fact, moving ecosystems wasn't difficult for me ever, I've gone from iOS to Android to WP and if I had to go back to Android or iOS its the easiest thing in the world. Its not like the apps and stuff go away, you're always one login/sync away from getting all your stuff back. I tend to mix things up a bit, I have an iPad, Nexus 1 as a backup phone, and WP as my main phone and I seamlessly jump from one to the other. The phone is the most important device I own, and I'm definitely more comfortable with WP as the daily driver. Less demanding than Android, more exciting than iOS.