I think of the Color Wheel like a tool in my sewing box, one that isn't needed very often but handy to have occasionally. I recently dug mine out to determine what color would compliment a fabric with yellow, orange, magenta, and deep purple. I rarely use this combination of colors. My thinking was a green teal and the wheel confirmed what I already knew.
The absolute most boring class I ever took in art was on the color wheel! :-)