It's very difficult to switch to a user's perception when you've spent a lot of time working on a product. Even if you didn't, being a professional in the field (game design, software development, even being an audio engineer while listening to music) really distorts your vision — so, if you want to predict the actual user/consumer's reaction, you'll better ask them.
This mentality tends to protrude in a lot of non-software related fields as well. There are many times for example where I question the layout of the instruments in my car or why my local grocery store stocks items the way it does. When you work with software/ui a lot, you tend to develop an internal organizational logic that's very different from normal users. This influence becomes quite noticeable when you have to respond to unfamiliar tasks.
