I too just finished the course. I did not pass. The first day was a challenge. I too felt that the new rig was dumping me on my head (I adjusted some weight and overcame the problem) . I had many equipment problems (Murphy's Law), including a blown out second stage. I too was very frustrated. Like Bob, I thought I had some skills coming in. I could hover, frog kick, plan my gas etc., share air with the long hose etc. The big difference for me was the level of proficiency with which I could do these things. Fundamentals is about getting the basics down spot on as a foundation for further training. I am a long way from spot on.
In the end I realized that I must be able to share air, deal with my valves, take care of any problem under the worst possible circumstances all while maintaining my boyancy and trim. That takes practice (I imagine for the remainder of my diving life) both to hone those skills and to maintain them.
My immediate reaction was: Why am I doing this? I'm a safe diver, comfortable in the water, fairly skilled. I've gotten out of situations and know how to handle myself underwater. But on the long drive back from Vancouver, I realized that these skills, these tools, will make me a better diver, more comfortable underwater and better able to deal with situations should they arise. GUE/DIR is just another way of training divers (albeit a much better way in my opinion) to enjoy diving and, most importantly, to dive safely.
Bill Ferrell