I think it depends. Some people don't care and will do whatever they want. There are some people though who will attempt to have some manners.
They decided to do construction on the one road we have through town here, so that has made this summer hectic. With no center lane any more, making a left turn will stop traffic for a while until there is a break. Most people will just keep driving through, which I can understand since sometimes you figure they'll be able to turn later. We are a small town after all so there isn't a ton of traffic. Now, when there is a backup, you can't go more than a car's length forward, and you don't let someone through, then yeah, I think they should let the car through and a lot of times they didn't.
I also see a lot of people at my job who will complain about the cost of a game of mini golf, and then use the clubs as hammers, pogo sticks, tightropes, canes, etc. I once had a kid hit one of the clubs so hard against (I assume) a tree that it snapped the neck. Not exactly a manners things, but definitely they aren't respecting another's item. Customers bug me a lot since they seem to think they can demand whatever they want and the employees must give it to them.
Then again, there are people who attempt to have some manners. Not exactly a fair assessment, but I would drive through town a little slower since there was so much stopping. By doing that, I'd create a gap between me and the car in front of me which people could use to pull out or turn. Or, if I was stopped, I'd try to avoid blocking driveways so people could still turn while I sat there. From another person's perspective though, they could think I don't have manners though cause I'm going 25 in a 35 zone. Or cause they want to make a right turn in the driveway that I'm trying not to block. I will also hit a point where I've waved the person through so many times and they haven't gone yet, that I'll just pull through because my lane is moving again. Personally I can't think of anything good that has happened to me recently, so can't comment on another's behavior, but I'm sure I'm not the only one.