Posting out of curiosity. I've seen both spectrums with parents - the ones who make sure everyone and everything is extra quiet when their LO is sleeping (be it naps or bedtime) to the point of whispering and the ones who have the TV blaring, laughing and talking and being pretty loud. And the inbetweens who act the norm.
Friends of ours made sure from Day 1 that their kids would go to bed and stay asleep with regular noise. Another couple with a 1 year old are doing the same thing. My parents did this too. It didn't work well on me since I'm a natural light sleeper, but was fine with my brother. On the other flip side, my aunt is doing the exact opposite with her 15 month old. When she's been put down, you have to whisper or talk very quietly and certainly can't do anything that might wake her up. I don't know how she gets ANYTHING done... I know DH and I will probably side on the "kid has to learn to sleep with regular noise" kind of thing when the time comes for us.
What do you do with your LO? Are you kind of in between?