Kate this is not pointed at you in anyway, shape or form.
I know, but I'd like to answer anyway.
The real reason behind surveys is volume. Not everybody cares enough to really think comments through, post them online, and be ready to discuss them. We also need feedback from everybody else. It takes a lot less effort to fill out a multiple-choice (or even open-ended) survey than to contribute to a group like this one. So I could come here, and find three people who are willing to tell me why a certain feature needs to be improved, in a well-thought-out and rationalized way, or I could search my survey data for 100 people with the same opinion. Both types of feedback are valuable. Sometimes one response leads you to collect the other. ("Hey, this guy doesn't like this, I wonder how many other people don't? or "Hmm, lots of people in the survey feel one way. Maybe I can look on the forums for people who are willing to talk about it.")
Several people do spend lots of time in forums, but unless it's the MyFeedback arena, it can be a risky place to be. Not everybody understands that even if you work for Autodesk, you don't always know everything, and you don't always have a direct line into bug fixes or the product release schedule. (Any guesses as to how many levels above me that particular decision takes place?) They're also more likely to patrol the Autodesk-sponsored forums, or MyFeedback, rather than independent ones. Like it or not, we are perceived to speak for the company, and sometimes it takes a little bit of a balancing act to do so without having somebody take something the wrong way. Honestly, if I weren't already established here, it might have been hard to come jumping in with an "Autodesk" opinion.
If you really want to talk to Autodesk on a regular basis, join MyFeedback. In fact, please do. The more the merrier.
Or send us feedback (Contact Us-->Feedback-->Products). Real people read those too. (I'm one of them for LT.) Otherwise, accept that most forums are peer-to-peer, and that there are other ways to talk to Autodesk.