On the admin index page, the left side will show the last five actions you have performed, the main content will show all of the pages you have added.
If it is not showing all of the pages in the main content area of the index page, there is likely some content in the database that is causing the list not to render correctly.
What browser are you using?
If there is content that is causing the list not to render correctly, you will need to go into the database and remove it.
As for the Explorer style listing, I will add a feature request.