It is true that your consciousness supports all these cognitive abilities and emotions. However the point here is that consciousness can also remain itself as thoughtless consciousness without having to identify with thoughts and emotions, especially that of a compulsive nature that creates tension, insomnia and anxiety.
It's like dating an interesting person, and then worrying incessantly about whether he or she would find oneself interesting or ring back. Or worrying about whether the expensive rolex watch you bought is genuine or a fake or whether your car parked outside will be stolen. You are putting your happiness and peace of mind in people and objects outside your control, all the time, and missing out on the present moment.
By being in the state of the witnessing consciousnes or awareness/mindfulness, you live in the present moment. Of course you use your mind to think, recollect and plan for practical purposes. But when you have used your mind totally, you switch off and don't keep thinking or emoting incessantly on the results, and rather enjoy the present moment and its pleasures.
You can learn more about mindfulness in these links...
Mindfulness Definition | What Is Mindfulness
The 23 Amazing Health Benefits of Mindfulness for Body and Brain (+ PDFs)
6 Scientifically Proven Benefits Of Mindfulness And Meditation