I've noticed, mostly from models from the 3D warehouse or from folks new to SU, that there seems to have been unintended edge-coloring. Normally, I wouldn't have noticed, except when doing more "artzy" modeling or when emphasizing functional elements in the model such as process equipment and I turn on Edge Style > Color by Material.
I know that I have often been in a hurry, triple-clicked surfaces or done a Select All and applied a material to edges mistakenly.
So the script is handy for reviewing a model and doing a quick cleanup.