I'm somewhat ambivalent on the question of whether my liberal arts education actually made a difference in my life, but "because I heard it in psych class" would be at the very bottom of my reasons to believe so. If you're going to hold the opinion that a liberal education teaches you how to learn and informs all your future decision-making, hold it because experiences have corroborated that, not because you read in a psych textbook that that's how it's supposed to work. Textbooks do lie, y'know. ;-)
Otherwise - well, you haven't really learned how to learn, have you? If the point of a liberal education is to make sense of the world around you and form your own opinions, and you're still regurgitating things you read in a book, that liberal arts education has failed.
First of all, I was being a bit tongue-in-cheek.
However, yes I do take much of what I've learned at face value. After all, it would be foolish to take years of expert research and toss it out because I personally didn't conduct it. Unless it runs wildly counter to my personal experience, I have no real reason not to trust it as the best scientific explanation at a given time. Thankfully my personal experience most certainly corraborates it.
There is a world of difference between healthy skepticism (consistently questioning scientific theory through empirical observation) and doubting for doubting sake. I haven't personally verified that the earth orbits the sun, but I'm pretty sure we have that one right after all.
In college you were exposed to philosophy, literature, and a host of other things. That self-educated guy generally knows a lot about quantum mechanics, but has never bothered to read a classic novel or has never heard of Kant. All of those things form the basis and experience that allow you to learn from the world around you so much more efficiently.
I don't think college is broken, I just think the expectation that college is somehow a four year skills-training institution is fundamentally flawed.
My viewpoint on this has definitely evolved over the last decade. At 22, fresh from dropping out of college after my junior year, I would have written the same thing. A decade of experience has taught me the value of what I learned in college.