VOTE: Delete = Disable account
The account deletion process removes your ability to log in and your user page. Your posts and comments remain. (You get warned that you're about to lose the ability to change anything you've previously posted and that your username will continue to be associated with your previous account activity.) Actually deleting everything requires you to do it manually, one by one. Your username would continue to be unavailable to others. Your user account page would be replaced with a "User account deleted" page. Your old account activity would remain and link back to the "Account deleted" page.