The whole idea of these lengthy Goenka retreats is interesting. I know that many have benefited greatly from completing the retreats, and others have had different experiences.
Having not attended one, I can't really have an opinion. A Thai monk with whom I was meditating did suggest that the Goenka path was not what he, the Bhikkhu, considered a proper practice of meditation as he saw it being taught within Theravada practice. I believe he saw these Goenka retreats as being akin to a marathon that people enjoyed completing for the sake of the experience. I know that he very much did not consider them to be part of the Dhamma practice that he was teaching.
Another of my teachers has commented that in Thailand, chanting is popular with the public, and that the public will attend the Wat for an evening of chanting, but that to get them to attend an evening of sitting meditation is much more difficult. Perhaps Goenka adds the Pali and Hindi chanting as a way to romanticize or energize the experience.
The hard part of practice is the meditation. It is also the beautiful part, the calming part, the insightful part.
I'd love to run a 26.4 K marathon just to say that I did it. But at the end of the day, if 20 minutes of walking meditation allows me to be just a little kinder, a little more compassionate that day, then the 20 minutes works for me.
Again, what works for others is always interesting to hear, and that's why I'm glad for this forum.