Im also wondering about the defensive pistol course and what it consists of.
The link below takes you to a list of the NRA courses. You can click on the "More info" link to see a pretty good description of what each course covers.
It sounds like you may be interested in these three courses.
NRA Basic Pistol Shooting Course
NRA Basic Personal Protection In The Home Course
NRA Basics of Personal Protection Outside The Home Course
With your 25+ years of shooting experience, you probably won't get anything of value from the Basic Pistol Course.
NRA Life Member - Orange Gunsite Member - NRA Certified Pistol Instructor
"When plunder becomes a way of life for a group of men living together in society,
they create for themselves in the course of time a legal system that authorizes it and a moral code that justifies it." Frederic Bastiat