Hi Matt,
You should still have access to these features. Are you saying that you no longer see Performance > Queues in the application? The article you linked to is for the new and improved Queues Performance views. The old functionality is still there, and here's the article for it: https://help.mypurecloud.com/articles/queues-performance-view/
The new views will show more statistics than the old ones, and allow for more customization (I've seen it in action, and it's pretty cool). (The title of the old article will change after release to avoid the confusion you just experienced--my apologies!)
The new views will hopefully release within a couple of weeks, but there will be a period of overlap so that you can continue to use the views you're familiar with, or try out the new ones.