Yes, when I work with couples, the effects are more immediate when both practice the Three Minute exercises and understand the concepts involved. So I heartily encourage you to have your spouse take the course along with you. The more time you spend reinforcing realistic thinking, the more effective it will tend to be. Again, with the language comparison, practicing a little every day would be useful but it's recognized that language immersion is most effective. The more you immerse yourself in reinforcing your preferences and exercising your musts, the more effective it tends to be.
Traditional psychotherapy is based on the Freudian model.
This assumes that your psychological problems as an adult has its roots in your childhood. It considers a dysfunctional childhood and poor parenting as the key to your current problems. In my view, that's barking up the wrong tree. Our emotions and our behaviors are generated by our current thinking, by what we tell ourselves in the moment. The Three Minute Therapy works best for intelligent adults, since it involves a somewhat abstract process of thinking about your thinking.