I've had "summer truffles," which aren't the real thing. Nowhere near the same amount of flavor. Otherwise, I believe I've usually had things seasoned with truffle salt or oil. I don't like the oil, but I use truffle salt a lot, especially on eggs.
I've had a few dishes with a good amount of truffle flavor, but I'm not sure how much actual truffle was in there. The flavor is unmistakable, though.

I'm visiting Spain next week and hitting some amazing restaurants. Hopefully I get to try an actual truffle shaving to compare to what I have had.