I have recently developed a Python script to check my favorite camera, lens and most used lens focal. The principle is simple: to read the Exif info from all my photos and count the numbers for above mentioned parameters. Based on the statistics result from the Python script, I can easily make the below bar diagram. Very interesting I find myself use telephoto lens more than others. I used to think I like to use wide-angle lens.
I have shared my script for free. If you want to take a try just go to https://github.com/philipjiang/pyPhoto.git.