Intimidation implies intent, and I think that most users who provide long comprehensive answers aren't doing so to intimidate, but are rather trying to be complete in their response. Now, that is my opinion about the majority of Quora users… Some may use this method of answering to "shout down" other answers with their own (volume). People are, as they say, different.
That such responses can be perceived as intimidating… Well, that will happen. We can't control what other people do or say, we can only respond. Some will respond with "Hey, that's right, I agree… But boy, did they overdo it with the images and the embedded content." Others will go "I'm afraid to answer now, because I can't top that guy." Both responses are understandable, because we all respond the only way we can… As ourselves.