Good for you!
It's good to hear you found it valuable. I personally think that getting quality training is more important than owning a large number of guns or having the latest and greatest uber tactical whiz bang gadgets. Those gadgets are great once you've discovered that you actually need them for your purposes after doing some training.
Going and getting the training you got is the first step to becoming proficient with your pistol. Once you are comfortable with the basic operation of the gun, then you should consider getting more intensive training.
As a CCWer I carry a pistol all the time. Before I started taking training courses dedicated to fighting with the pistol I had no idea how important that training was. There's a lot to know, and there are a whole lot of skills to master.
With this first class you took you should be comfortable enough with your weapon to start learning how to fight with it. Real quality training can make the difference between triumph and tragedy. I hope you continue the learning process. It's very rewarding, fun, and can save a life.
To answer your question is difficult because everyone has different needs, and different financial situations/time restrictions, and different reasons for owning firearms. There is also an ego issue I suppose. Some people just don't understand the need for training. I'm sure that having had your eyes opened a bit after doing some real training you have come to see how valuable it is. Not everyone has had that oportunity. My first civilian training experience completely changed the way I looked at firearms, and that was after 4 years of being active duty Army.
In any case, don't stop your roll now! Get out and train some more. You'll never regret it.