Full Wallboard plugin let you see lots of data regarding your queues. You can configure it to show only its widgets on the user you want by making some configs.
Create a new user that is not related with an existing extension. Username should be a number, so use a number that is not an extension of any kind.
Assign to that user ONLY the 'All Queues' group. Also assing to that user the Full Wallboard plugin (if there are more plugins there, dont worry, but avoid adding Simple Wallboard)
At the 'Full Wallboard' plugin configuration you can set "Hide Queue Buttons" option to YES, so you will only see the Full Wallboard but without the queue buttons box.