Ah, well. I'm reading Sociology at University now, and I did A level sociology and it's... well. They have very little in common. The ideas expressed to you are more complex, your understanding of it is supposed to me much more complex. Also, generally they don't really slow down for you, you're expected to keep up (although if you really need a long explanation they generally will talk to you after class). You're expected to do your own analysis of the discourses you're being presented with.
In short, Sociology at degree level is definitely more intense/intellectual/challenging.