With all the plugins, brushes, etc. that I’ve added to Photoshop, I view
the requirement to trash the installation and reinstall before running
9.0.2 as burdensome. >>
The easiest thing to do is to Save all new Actions, Styles, Brushes etc. that you may make to your Presets Folder.
Then make, and KEEP, current Backup COPIES of both your Presets and Plug-in Folders.
If you then have to re-install Photoshop at any time, you just replace the newly-installed Presets and Plug-in Folders with copies of your Back-ups.