you're right...the material itself is not more difficult; there's just a lot more to do.
-the classes move a LOT faster
-you're busy most of the fall with interviewing
-if you're on law journal/review, that's like having another class
-same for a moot court competition if you do that (which you should)
-plus, any extracurricular stuff you might do
and nothing's scheduled for you like it is 1L year...you do it all. finals on consecutive days? sorry. a morning final and a night final on the same day? no one cares. try to avoid those, by the way.
it's not unbearable, but it makes 1L year seem relatively slow. all i'm saying is, congrats on getting through first year, but don't lounge back too much. 2L is about a whole different skill set.