Duuuuuuuuude.
It's fairly obvious.
He's 800+ years in the prequel trilogy, so he can't just walk aroung like Anakin or Luke. He needs that cane. His style is Ataru because it's principle of using the force on your body to enhance it just fits right into an 800 year old guy's alley. Plus, he is really small, so it's easier for him to propel himself with the force.