Basically, the article says David Allen is right. Getting Things Done is a religion to many, but for me it was a collection of a bunch of little tips that really did help. For $9 its worth a read.
If you use OS X, there is an excellent app built around the GTD methodology called OmniFocus (if you also have an iPhone, there's also an iPhone app that syncs with the desktop app). Both are very well worth the money.