I know all babies are somewhat different, but at least ours seems to be happy to sleep through most noises - up to and including using a vacuum-cleaner in the next room.
I try to keep things a little quieter than usual around bed/nap-times, but otherwise the family life must go on. If the baby wakes up sometimes because you boiled a kettle, dropped a book, or turned on the laundry then that's just something you have to deal with at the time.
Where a (video-capable, audio-muted) monitor helps with my 1-year-old is that I can see at a glance whether he's just fighting a loosing battle with sleep, or if he has won that battle, is standing up and sleep has lost this battle.
If it's the former, I dare not open the door. If it's the latter, I need to go in and rock him back to sleep. Having this tool has saved him and I from many cranky, nap-deprived days.
And, btw, it's a dumb monitor with a ~400 foot range. All 3 neighbors within range are trusted to watch the kid - if they want to help, great!
We never had any real issues with either of our kids, and only false alarms. But I know my wife got better sleep just because the alarm was there (only in part because I was usually the one to check when the alarm went off).
We stopped using it nearly immediately. It was a glorified audio only monitor for us, the check for movement/breathing was giving lots of false positives and drove us insane.
Other parents even turned on a beep for each breath, made it sound like a hospital. You subconsciously gold your breath if the device beeps with a tiny delay.. beep..beep....???beep
For us it was the wrong choice.
Definitely is a sanity-saver.
Yes, we use a movement-based monitor and have for the last 6 years (3 kids). It doesn't require anything on the baby, and sits under the mattress. Sensitivity is adjustable and it's very accurate. It truly lets me sleep better at night.
Now, what would be really helpful for small babies is consumer-available version of the 'clicker' breathing monitors they use in NICU wards. Our oldest was in NICU for nearly two weeks due to being a little prem, and when we got them home the lack of that regular 'click... click...' from the monitor was so hard to get used to.
It's not a medical grade device like the NICUs have, but it lets you rest easier knowing you'll be notified if your baby's pulse or O2 levels drop.
Sure: baby monitor security is important too: if you can get it right for a baby monitor you've probably got the framework (technical, social, regulatory, etc) to get it right for a bunch of other things.
But are baby monitors themselves solving a problem or causing one? The alternative is to either have the baby in the room with you (distracting: they're like a campfire!) while you do your chores or talk to your visitor or whatnot, or learn to be able to be in another room from your baby.
Sounds luddite, but it helps lay the foundation for a healthy, non-helicoptering relationship with your kid and doesn't slip tolerance for pervasive surveillance into your home.
My counter example is my sister in law who is very helicopter of her first child, even now that he is over a year old. They've been in small apartments, and have traveled a lot with him in arms(no car, so no car seat). I doubt they have ever used a monitor. I bet if she had had more opportunities to put him in another room to sleep without concern, she'd be more willing to let family play with him in other rooms of my parents' house during holidays.
I think that's a pretty big exaggeration. "helicopter parenting" usually characterises parents who refuse to/cannot step back from their child's life and let them make decisions on their own. A sleeping newborn child cannot make decision on it's own - the only acceptable form of parenting is helicopter parenting when your child isn't capable of doing anything for itself!
Sudden Infant Death Syndrome exists. You can hardly blame people for wanting to protect their child from it.
She was alert when the paramedics showed up, but the subsequent tests at the hospital proved nothing. The cardiologist, nurses, and other doctors all seemed to agree that it was "nearly a SIDS thing" and that we just got lucky.
After that night, and for every night since (2 more kids since then) we've used a breathing monitor. Occasionally I've noticed the kids will go in a "deep sleep", and the monitor will go off a few times during the night, you'll have to reposition them; they'll wince (in their sleep) and carry on. If that's what it takes, then that's what it takes.
From my research after that event, it seems like SIDS is all-encompassing, and the amount of time allowed for an infant to slip into death may play a factor in it's "suddeness".
But with our first child we had a near-SIDS experience; nothing terrible came of it, but it definitely shook my core.
Having a baby monitor that tells when it can't feel the baby breathing any more is a complete sanity saver. It's the one and only reason I recommend them.