I suggest you hide the Drafts, Sent, Spam, and Trash folders via the method i have below. The All Mail and Starred can be disabled if you have the Advanced IMAP controls enabled in Gmail Labs.
To hide the drafts, sent, spam and trash, just select one of them. For example, select the drafts mailbox. Then go to the menubar at the top and choose Mailbox>Use this mailbox for>Drafts.
Do the same thing for the sent, spam, and trash mailboxes.