No. Everyone uses 100% of his or her brain.
Isaac Asimov (1920-1992) once wrote an article regarding this (which I cannot find , unfortunately) which reemphasized that different areas of the brain do different things; in addition to the higher cortical functions of reasoning, the brain, as the primary organ for the body's nervous system, is busy regulating heartbeat, breathing, motor functions, and all the other critical neurological functions for survival. Additionally, the brain is busy processing auditory and especially visual data. I believe he understood the 10% statement to mean that only 10% was used in the higher cortical functions -- and that the remaining 90% was busy on autopilot keeping us working. If we could use 100% of the brain as cortex, yes, we'd be superintelligent! ...but also 100% dead from lack of oxygen, heartbeat, nervous and sensory processing.
The link suggests some origins for the "10% Brain Myth:"