At least at my university, once you get past Calculus they don't have the funds for paying for graders, so most professors won't collect homework (though you're a damned fool if you don't do any of it, it just means you can do what you need to do to study rather than being assigned busy work for the sake of busy work). Computer Science isn't too bad either, there's a few hardcore classes that require many hours of your time, but in general it's just a nice few hour assignment every other week, and as long as you plan ahead you won't have as much difficulty.