Hotel guests (unless staying with DVC points or on a package deal) pay a $12 Resort Fee. On top of that is tax, bringing it to $13.80, if I remember correctly.
This Resort Fee pays for newspapers during the week, the workout facilities, and parking. Even if you don't use those things (and if it's a weekend when you don't get a paper) you pay the Resort Fee, by the way.
Anyway, that's the long answer.
And you can park as soon as you get there...we once did early check in at 6am...and you can stay until midnight the day of checkout.
In addition, you do have in/out privileges, of course.