Try to make a simple tutorial video of some sort. Even if it isn't useful in a practical sense it forces yourself (or someone else) to walk through the UI stati

Try to make a simple tutorial video of some sort. Even if it isn't useful in a practical sense it forces yourself (or someone else) to walk through the UI stating their intentions and trying to execute them. Some of the best feedback I've gotten was through watching videos like this for an application that I work on as you can see where the stumbling points are throughout the process.