From hearing my friends talk, I thought Babywise was the only way to raise your baby, so there was no question that I would use it too.
I read the book before my daughter was born and re-read it again after she was born. I felt like I had to really work hard to get her on a schedule or she would be a brat and never sleep through the night. So, the first week I immediately tried getting her on a three hour schedule. I always felt guilty when I would stray from the schedule a little or when I didn't follow Babywise exactly. I felt like I had to defend myself to my friends if I was straying from the book.
My daughter got on a schedule pretty well, but it took a lot of crying by her--and me. She started sleeping 8 hrs through the night when she was 10 weeks old. By the time she was 4 months old, the whole schedule thing seemed to be falling into place, and I just thought it was normal to have to go through a lot of crying in those first few months.
I now think that I made her cry it out at too young an age. Working from the 1998 edition of Babywise, I took to heart the "45 minute intruder" (stirring and crying partway through the nap) that Ezzo said meant that the baby had not slept long enough, and I made my daughter cry back to sleep during her naps when she was probably hungry by then.
But after the first couple of months, I felt like Babywise was keeping me from following my God-given instincts, so I really relaxed a lot and decided to follow my dd's cues more.
Nevertheless, I lost my milk supply at around 5-6 months. At the time, it was puzzling to me, because I had TONS of milk in the beginning. After comparing my experience with other mothers, I suspect the problem was the Babywise schedule. Unfortunately, I got pretty much all my lactation knowledge from Babywise.
When I was pregnant with my second, I decided I wouldn't do BabyWise, and would try to enjoy the early newborn stage instead of stressing out about a schedule. My son also had some health problems in the beginning and I decided then to follow his cues and feed him when he was hungry and not make him wait. I wasn't concerned about a schedule, I was concerned with him gaining weight and getting well.
Looking back, I don't think I was able to truly enjoy my first baby like I should have, because I was worried about scheduling and sticking to BW. I am very thankful that I did loosen up a lot with it and didn't follow it very closely at all after a while. However, I am very disillusioned with the whole program and wish I had never read it.