Couldn't stand caravan parks when we did our trip through central QLD. Full of grey nomads who all were in sore need of hearing aids so they knew how much freaking noise they were making. Could hear them from the other side of the park just having a conversation, and it was still mostly "What? I can't hear you. Speak louder" or various repetitions of misheard words.
Didn't really effect my sleep, having lived in a boarding house with 30 other boys for school (honestly it was MUCH quieter than the caravan parks, mostly because we all knew and respected each other) and put up with my family (chainsaws got nothing on my father's snoring) I can sleep through anything once I get to sleep. Just annoyed the hell out of me when I was awake.
Note: Knew and respected = Knew that if you were a wanker you'd find yourself in the deep end of the pool in the middle of winter in the early hours of the morning and you respected that fact...
As for my noise levels, if I was in camp (instead of doing something) I'd be reading a book, on my laptop with headphones on and running off powered sites or batteries. When we go away from power we run the generator until the last person goes to bed, I've never been able to convince them that 12V lighting could replace the AC fluros and it would be silent
If anyone else is bothered by it I've never seen them, that is I've never seen another camp site within a few km's of where we are, so I doubt we'd bother them even if we brought a set of speakers made for a stadium and blasted Skrillex out of them.