I have used the "board" method for about 20 fairly large quilts. My boards are 84 in. long. Actually the prepping time is not nearly as long as it seems on the video. I agree video makes it seem very long and painstaking.
I actually added a step: I roll the backing on one board and the batting on the other one. I spray baste these two layers. Then I work with the basted backing/batting on one board and the quilt top on the other board. It's actually quite fast and it's very easy to keep the layers smooth. Having all the layers rolled onto the boards gives everything a certain tautness that eliminates any possible wrinkles.
Like anything else, the first time takes a little longer, but after 20 quilts, I am definitely a fan of this method.