I rarely used them for class, other than the E&E for civ pro and an outline for Conlaw (although if I had to do it over again, I'd get Chemerinsky's hornbook for Conlaw).
I always used them to prepare for finals. I would skim through concepts in the E&E, or sometimes just go to the review questions after reviewing on my own. And Seigel's Essay Exam books, with sample essay exams and answers, got me through 1L.
Edit: Ah, how could I forget Dressler's Understanding Crim? I loved that book, and used it religiously (didn't hurt that we used Dressler's casebook)!