If you have to implement a feature and you have two ways to do it: the easy way or the hard way, which one would you pick? As a developer, when you look at your product you see its architecture. You see how all the parts fit together. Likely, you were involved in coming up with this architecture. You're a believer.
So, if software is beautiful from the inside, is it also beautiful from the outside?
If a user asks you for a feature that does not fit your current software architecture -- does your software architecture need adjusting, or does the user need adjusting?
If you walk into a plane, would you prefer to walk left, into the cockpit where you have full control over everything, have access to all the sliders and sticks -- or right, where all you can do is push a button to call for a stewardess to bring you coffee?
What does your wife prefer: flexibility or simplicity?
If you give a non-technical person the choice between an Android or iPhone -- which one would they pick?
Does your mother know how to use a VCR or DVD recorder?
How about a [Google TV](http://www.google.com/tv/), an [Apple TV](http://www.apple.com/appletv/)?
[Read the inmates are running the asylum](http://www.amazon.com/Inmates-Are-Running-Asylum/dp/0672316498). I bet it will change your view on the importance of user interaction design forever.