1) It is a reminder of the importance of strong foundations... Without the fingers and toes spread wide and planted solid with knees and elbows tracking, this posture isn't half as steady as it should be.
2) Wheel counter-stretches the effects of hunching over my laptop, long journeys in my car, and carrying my baby boy... My body craves being opened up through the front and this posture delivers.
3) I find that after practicing I walk with much more confidence. The heart-opening effects of chakrasana last way beyond the end of the practice and the opening through the solar plexus, heart and throat chakras all at once get me feeling like Wonder Woman; 'I just took five breaths in wheel, I can take on the world!'