I agree 100% with @RichInPitt - painting all summer programs as “ a type of summer camp for kids.” is a lazy, simplistic generalization.
My kid has been attending summer courses with CTD (that’s Northwestern’s version of JHU’s CTY) since she was in 3rd grade. The point was never to enhance her chances of getting into a “good” college. It was always about giving her the chances to learn new and interesting things with other gifted kids. It was about “expanding her mind” (to be pompous), and about making sure that summer break wasn’t an “intellectual wasteland”.
While in High School, she took Neuroscience and a Creative Writing Workshop. Aside from the high school credit she received, she was able to develop her interest in Neuroscience (her present major), and not only was she was able to develop as a writer, she had the privilege of taking a workshop with one of the up and coming stars in creative writing.
She was always extremely excited to start, she always had an amazing time while being there, and she always learned a lot, and made great friends.
The classes may help a kid get into a college, though in indirect ways. First, the CTD classes appear on the transcript, and, aside from the fact that they demonstrate additional rigor, they can demonstrate interest in a person’t chosen field (taking advanced classes during summer break). Classes like creative writing workshops do increase one’s writing abilities which help in things like the application essays.
Moreover, these classes can open other opportunities. For example, a poem that my kid wrote during her creative writing workshop was a finalist in an international competition, and was published. Things like this do enhance one’s application, albeit in minor ways. Other poems she published resulted in some other great opportunities, though she did not follow up on them, since she was taking a different direction (STEM related). However, for somebody who was more focused on creative writing, those opportunities would likely have provided all sorts of “enhancements” to their applications.
All that being said, the fact that the organization is connected to Northwestern University, and the summer courses were mostly on the NU campus, would not provide any higher chances of being accepted to NU than similar courses with Johns Hopkins’ CTY. Nor would those CTY courses provide any more advantage for students applying to JHU than would the courses provided by CTD.
PS. another way in which they helped my kid get into college, was by demonstrating to her what it was like to share a classroom with kids who were just as engaged and as bright as she was. Knowing that she could have this at college kept her focused on doing well enough at school to keep open as many college opportunities as possible. There is a difference in how a kid who is bored in most classes sees their high school years if they know that things will get better after they graduate, as opposed to feeling that “being in class sucks”, and that college would be just another four years of the same thing.