I have been meditating for the past 15 years, or so. Initially this was mainly breathing and Vipassana through Buddhist studies and meditation at Buddhist temples. More recently I have started to also do Naam Simran and Vedanta meditation techniques. Transcendental meditation is so popular and I always hear about it mainly through celebrities. It seems essentially like a Naam Simran, or other mantra based meditation, so why are there such elaborate courses and why does it seem so cultish? Thanks.
Om shanti shanti shanti.
I am no expert. Still, I have some thoughts on it.
Japa is japa, not meditation. (in my school) and the purposes might vary from teacher to teacher, school to school. There are many factors involved: the personal ability to concentrate, the 'awakening' of the intitiator, when it's done, how it's done, and much more.
Here's a story on initiation: A king hears of the greatness of mantras, so summons his kulaguru for initiation. The Guru refuses, saying, "But Your Honour, you haven't done any preparation. I don't feel you're ready for mantra diksha." The king gets angry and dismisses the Guru from his court. On the way out, the Guru yells at the guards, while pointing to the king, "Arrest that man!" The guards do nothing.
The king, now even angrier, commands the guards to arrest the Guru, and they straight away arrest him. But the Guru somehow convinces them that he has one more word with the king.
He explains "This is how initiation works. Your father gave you the authority to say 'Arrest that man!" I wasn't given that authority. Sp the words worked for you, but not for me."
Understanding his mistake, the king prostrated and vowed to do some preparation for diksha. 6 months later the Guru granted it.
Also, there is a great difference between a mantra, and singing praise of a mantra. These days those two have often been confused.
Whatever you're getting out of a mantra is great. But there may be ways to get greater benefit.