In my experience, very similar.
It is difficult to put into words. Vipassana has been around since before Gotama Buddha and the guy that repopularized it in the 20th century, S. N. Goenka, has tne discourses of one hour each on Spotify if you are so inclined.
I will attempt to summarize as succinctly as possible but will indubitably miss some important points.
Basically, it is a meditation technique that trains you to be equanimous (mentally stable) rather than reacting habitually.
Before you can learn the technique and implement it, you need to be living a moral life (there are eight precepts - no killing, etc…) Then you can train your mind experientially to be equanimous and recognize the impermanence of everything.
There is more to it, but that’s the main idea. The secret is that there is no secret. I summarize by saying:
1 - play stupid games, win stupid prizes (karma).
2 - train your mind.
3 - purify your mind.
The Pali words are Sila, Samadhi, and Panna.
The hours of no mental stimulation left my brain in pursuit of things to do, so it went up in the attic and pulled out a bunch of unprocessed shit for me to work on. Then down in the basement for more unprocessed shit. Then started in on all of my closets.
I would say that it shifted my paradigm. I would not say that it was transformational, but that it can lead to significant transformation if the practice is continued - like most self help programs.
The biggest difference, as I see it, is that through the seminar you are practicing the technique and learning it experientially rather than just intellectually. Reading or hearing something and understanding it is not the same as doing it and experiencing it.
A side benefit is that the lack of mental stimulation is a dopamine fast and results in some amazing experiences - oatmeal never tasted so good.