Junk mail disabled but still filtering on Maverick
One at the time.
Your web mail (the Google web site)

Use settings there to show or not the Spam folder in Google mail.
Google (gmail) said: messages that have been in Spam more than 30 days will be automatically deleted!!

Now you can show or not on your Computer (by selecting or not the SHOW in IMAP)

On your computer:
After you have disabled the show in IMAP in gmail settings, restart your computer's email (Mail.app) program, and the Spam/Junk Folder will be gone.

The next is in Disable the Junk mail filtering on your computer that is done here.



Remember the Gmail (web) will be still filtering according to your junk mail settings there.