Now, I can't comment on all art programs, but I can comment on those I've had some experience with, which were all similar.
There are a ton of people that want to go to art school because they either think they are creative, or they want to explore being creative. Those people need hand holding, because they suck. They are the people that might not even benefit from the basic bullshit at the beginning because they are either too proud, think too highly of their skills already, or aren't committed enough.
Then there's the people that are already really good. They may be a little cocky or think highly of themselves because they already know the basics, either formally or just based on observation and self discovery. They don't always to well because they think that the first two years are bullshit that they can't learn anything in. Then they get to upper classes and not having a super strong foundation to fall back on, they often flounder (not always).
Then there's the third group - they range from the people that can barely draw a straight line to people that are already drawing at a really really advanced level, because of other instruction or self discovery and observation. The difference is that they are there to be a sponge; suck up every ounce of knowledge from professors and really do shit proper. Even the remedial stuff, they work hard on, ask questions, and nail it because they approach an art program with an open mind. The people who already know their shit push into it harder, as there's always room for exercise of those basic principles.
The third group of people, in any program, are the people that excel in school and come out of it knowing they spent their money well. ANY program is what you make of it.
School isn't for everyone. I'm would never say it is.
HOWEVER, leaving highschool, you're going to have to work your ass off to make it either way. you can either pay people to tell you what to study and have them available as a resource, or you can work towards finding other resources. Either way, you have to WORK YOUR ASS OFF to be successful. (unless, of course, you catch a lucky break.)
It's really just a matter of where you want to spend your time.