I, too, like Sharon Schamber's way of basting a quilt. After a while my back hurts, so I have a hard time pinning a quilt. Doing it Sharon's way, you can actually sit down while pinning and the boards really help to keep your fabric from being distorted.
When you tape your quilt down, you can get a big distortion, as well as wrinkles, because your quilt top or backing may not be on a straight-of-grain and it stretches very easily. Additionally, if you don't sew your binding on correctly, you exacerbate the problem and get those wavy borders on the edge of the quilt too. I think that quilters call them "lettuce edges."