I think that is the thing a lot of new parents don't realise, all kids are different. My little lad sleeps through and we can sleep in until 10 some days because he's happy as larry playing in his cot. What works for one family may not work for another, hell, one worked for my daughter doesn't always work for my son.
I always tell new parents as well, when you're rocking them and think it's time to put them down, ALWAYS wait another 10 minutes Nothing is worse than putting them down, turning away, reaching the door and hearing that cry...
Quoted for truth. We do the arm test: if you lift an arm and it flops back down we are good to go. If it stays up or grabs you then quietly retreat until she's asleep enough to get into her cot. That 3ft down into the cot is the longest yard.