I think the most important point from that Discraft video is the confidence you'll develop simply by making the short putts. Mark Ellis actually stresses that you should forget about the 30-50 ft stuff for while and get used to making putts from about 15 feet -- whatever is comfortable for you in terms of consistent makes. During that time, your own form will begin to develop and you'll get stronger.
I'll use myself as an example. After seeing that video and listening to Mark Ellis talk about putting and how he recommends practicing, I decided to give it a try. I made sure I did nothing but 15-foot putts for two or three days. It got to be kind of monotonous, but I made sure I went through the routine of setting my feet, gauging the wind, picking a link, getting mentally prepared, and letting it fly. By the end of the third day or so, I began to move around in terms of distance. Everything was easier. 15, 20, 25, 30 etc all began to fall more consistently. I even sank a couple from about 50 just for the heck of it. That was kind of an anomaly, I don't make 50 footers routinely, but I will sink them more often now. It's a great feeling. Whenever I practice, though, I stick to the short stuff just to build confidence.
I just shot par on the Monster course at Hudson Mills this past Friday. 2 months ago, I was +13. I didn't play the course at all between May 3rd and and July 11th.