Actually for those of you who really want to get the old Excel output in a Moodle 3.1 or Moodle 3.2, it is easy to do. Just get the file, analysis_to_excel.php from a Moodle 3.0 feedback folder and place it in your current Moodle feedback folder. Go into your current Moodle and go to the feedback activity. In your web browser, where it is showing ...yourmoodle/mod/feedback/view.php?id=somenumber, replace just the word view with analysis_to_excel and hit Enter and you will get the Excel report you used to get.
FYI to all, there's a related Tracker for this: https://tracker.moodle.org/browse/MDL-54774 which leads back also to https://tracker.moodle.org/browse/MDL-37132.