Developers are not users (Doh!)

Is the wider IT community starting to realise that you can't determine whether something is usable without trying it out with ordinary people (i.e. not developers)? An article in this week's Register concludes with the following:

"The problem is that we all think we know what usability means. But we all view it from our own perspectives. The trouble is that I, and probably most of you, are working with technology all the time, and we make assumptions about how easy it is, and what constitutes improved usability. That may be reasonably when you are considering what would be easier for an application developer, say, but it isn't when you starting having to think about inexperienced end users. It is probably a long time since any of us were in that position and it is simple to underestimate the complexity of the technology for those that are not familiar with it. The question is: how much more are we taking for granted?"