I love to get to school early and look forward to the car rider line-up. This is not because I enjoy the chaotic rush of cars and strange driving habits of other parents, but because of the way the school literally looks as if it has burst at the seems.
But most children do not have ample opportunities to "motorically express themselves". It is important that they have some down time upon return home. Although it's tempting to ask lots of questions regarding, "How was your day?", the reality is your child may need to have some time to decompress prior to engaging in detailed conversations. Allow play time to release some of that energy that had to be contained during class time. Unstructured play such as free time at the park or indoor moving to music can help decrease some of the stress that accumulates during their school day.