Hello Curtis
We must keep in mind that any QoS mechanisms employed will only kick in when there is congestion. Imagine a GigabitEthernet port on a router or switch receiving traffic at rates well below 1Gbps. As soon as a packet arrives, it is processed and forwarded. The packet never enters any queues. Such packets are served on a first come first serve basis simply because the bandwidth is available to serve it immediately. If you have no packets in queues, QoS mechanisms are not activated, simply because they are unneeded.
Queues will begin to fill up only when traffic arrives on an interface at a rate greater than the speed of the port. Once you have queues that are non-zero in size, only then will QoS mechanisms be applied.
For more info, take a look at this NetworkLessons note on QoS.
I hope this has been helpful!
Laz