There are several ways to fill out a survey. Some people just click randomly to get through the survey and get credit for their opinions as quickly as possible. Others give answers that they would like to be true while still others give the answers they think are supposed to be given. The fact is that it always makes a lot more sense to be honest in an online survey. Quite apart from anything, your gut reaction to such questions is likely to be the most honest and the most correct, so you will get through the survey in quick time anyway.
Giving the true answer to each question is also beneficial from the point of view of getting things to be the way you want them to be. No, big companies do not listen to the opinions of individuals – until there are enough of those individuals to make a large grouping, at which point they see that money can be made. You, as the survey taker, are much better off giving honest answers, as the company will then be more inclined to work in your favor.
Online surveys do not take up very much time, in any case. You will usually be informed before you start the test how long it should take. If you are quicker than that it usually will not matter. But taking the time to answer honestly is likely to work in your favor when the survey site master chooses to distribute surveys to frequent, valued site users.