Im first year Law and my general experience is that you put in exactly as much as you want to work wise. If you want to get a good degree and by proxy, a good job at the end of it all, then you work hard. If that bothers you less, then you dont do all the work. I for example have done work experience, mooting etc etc.
Social life wise, there have been a few times when i simply havent had the time or the energy to go out with friends, though it rarely happens. As a first year I would probably say i do have more work that i need to do compared with other courses.
Hope this is some help...