I'll respond in two ways.
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.
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.