Just before I had dd I had a sudden panic and got out three different parenting books from the library. I didn't get very far into any of them before thinking "Hang on, if the so called experts can't agree on how to do things I'll just do it my way".
For the most part, my way seems to have worked for us. DD only slept on my chest for the first 8 weeks or so but I kept trying her in her cot(cosleeping is not for me long term), and by 10 weeks she was happily going to sleep by herself. Unfortunately although dd has always gone to bed without complaint and settled herself to sleep, at 21 months she has still only slept through the night 4 or 5 times. Unless she is ill she'll only wake once though, and I figure she'll outgrow it eventually!
I always fed on demand, even when she went onto bottles but she had found a basic routine of her own by 3 months anyway. Funnily enough the feed/nap times in her own routine were quite similar to those in the GF routine (which I personally could never have implemented!)
I have tried to do the same with DS, I feed on demand,I let him sleep when he is tired, I have had to leave him to cry for a few minutes sometimes when I am dealing with dd, and he always cries in the car or pushchair (both of which he hates), although then I'm not technically leaving him to it, there's just not a lot I can do about it at that particular time! He is 12 weeks, and hasn't settled into any kind of routine at all by himself yet! His feeding is still completely random, as is his sleeping, the night before last we had a 7 hour stretch, last night he was up every 2 hours.
When I compared him to dd a few weeks ago and realised she was in a routine by then I briefly tried to follow the baby whisperer but just found it too stressful! I am actually much happier not worrying about when he should be doing certain things and just going with the flow but that's me, I apreciate that other mums will be happier following a routine, whether it be in the babywhisperer or GF mould.
One thing that does annoy me though, is that every single person I know who has successfully followed a strict routine is so damn smug about it and so adamant that their way is the only way. Yes GF might mean my baby sleeps through by 8 weeks or whatever, but that doesn't neccessarily mean I will be happy following it, or that my baby will. On top of which, getting my baby to sleep through just isn't the most important part of parenting to me (although I appreciate that we all need sleep!). I can appreciate that different parents need to do things differently so why can't they? TBH I think if you manage to follow it successfully then it was suited to you in the first place, not that it will always work for everyone.