Once again, you're not reading carefully. I said that restoring all your settings one at a time CAN be a royal pain, not that it IS a royal pain.
Once again, you're not reading carefully, no, restoring all the preferences is pretty darn easy and when it fixes such potential issues, is a fix.
Just make a screen capture of the General Preferences if you're really mucked around altering them to such a massive degree you can't recall how to set em. OR as I suggested before you arrived, keep a back up if it doesn't.
What is a royal pain is that for some reason, over dozens of years, we have seen Photoshop prefe's get hosed and cause all kinds of issues within the host product.
No, that isn't accurate. If you Ctrl-click and drag the prefs file, that will copy the file to the new location as you describe
Depends on
where the preference's reside (which drive) and
where you move that file to. In any case,
before you arrived, I suggested to the OP he copy the preferences, then told him how to delete them easily upon starting up PS.