I am using the function wp_dropdown_pages today and found it really hard to use.
The documentation is ok but there are no examples. It took a long time to find out how to get the pages to list like the sites menu and not some random order. The documentation on this site couldn't explain it but someone the forums did.
I am still having trouble finding out how to use a title in the dropdown box like "Select a page" as the documentation doesn't cover this.
Maybe the dev team could look into completing the doco on this function a bit more with examples of usage and how to use the variables. They don't really seem to work