Well, I would say I am a very on demand and healthy and "green" habits mommy in more aspects than just feeding, but my baby girl has been sleeping through the night since 8 weeks (six hours) and at 12 weeks until now at 4 months she sleeps on average 10-12 every. single. night.
I think on forums, you may find that people post what they are struggling with, and for babies a lot of times that is sleep! I dont really think its that the moms that have babies sleeping are somehow being neglectful LOL
For example, my daughter hardly ever cries, but I struggle to get her to "like" baby wearing for more than 30-60 minutes at a stretch, and she cries...it bothers me because its so unusual for her to get that upset, so I post about that. A mom that doesnt have issues with baby wearing wont post about it. And same with sleep. Healthy moms that dont have issues with sleep for baby dont necessarily post because they either cant relate or dont really know why their baby sleeps when "so many" others seem to be having trouble. KWIM
Now, I dont know if you are asking for input from those that have "good sleepers", but I have started thinking about this because I wonder what may have been different with my routine from other routines. As far as how I got DD to sleep...I really think its a combo of personality, and that somehow they learn to self soothe... though this is obviously easier for some babies than others. My daughter woke up every 2-4 hours for the first 8 weeks. She always woke up when I placed her in crib (I don't do co-sleeping for several reasons, personal choice though I know), and if she cried (not for hunger) when I placed her in bed, I didnt pick her back up but rather continued singing or stroking her or patting her, usually immediately helping her stop crying, and she would fall back asleep. If she woke up again and cried, I would do the same thing. If she woke up a third time (or if my singing or whatever didnt work) and cried I would get her up, rock her until she was asleep and repeat, repeat, repeat. On the night of her 8 week birthday she went to bed and never needed me to help soothe her, and she has been doing that ever since. I think she learned to self-soothe and now I just put her in her to bed and she snuggles into bed, I watch her on the monitor as she nuzzles her hand or stares into the night and peacefully, no crying, falls asleep...but this is easier said than done for some little ones, so I am by no means saying that it was my technique...rather that its NOT because mommy would NOT get up and let the baby cry it out or something of that nature. I do think so much of it is personality of the babe.
All that said...Im sure its incredibly frustrating to be doing everything RIGHT and baby just will NOT sleep, darnet! Good Luck~Smiles.