Our mind is what keeps us aware (some of us more so after a cup of coffee in the morning). The mind governs all of our choices and filters the massive amounts of information we encounter daily. And it never really stops; it keeps working even when we're not telling it to—daydreaming, telling our stomachs that we're hungry, putting one foot in front of the other. Our mind is the boss of all of that. Moore celebrates both the conscious (things we are actively thinking about) and the subconscious (things we do out of instinct) in "The Mind Is an Enchanting Thing." Basically, the mind is in the driver's seat and we're just along for the ride.
Moore valued the clarity of the conscious mind, and most of the examples in the poem refer to that particular part of human thinking.
What goes on in our subconscious mind (which we have no control over) is more important to Moore than conscious thought.