To whom it may concern (almost everyone!)
I have been working since 1981 making files. How can I find something among these monster masses of mismatched filing systems?
Finally the answer occurred - but (shock / horror) you HAVE to use the terminal.

This works best because it repeats the folder name on each line -
This puts the resulting file in ~/Downloads

>> find -ls > ~/Downloads/IndexTree.txt

afterwards, open the TXT file and replace ./ & / with "*";
also replace "user user" with "user *" to delineate size & date
date for this year do not show the year - gee!.
Replace "" with space

Then open in XLS (Libre Office) column delineator "*"
Save-As XLSX - (plain XLS only does 35,000 rows)
Delete first column, replace with auto number 1 thru whatever
Select all, SORT by column C & next 7 columns - goes to col G normally

The above works a treat - just change the file name according to folders surveyed

So why do all this? Because now you can open your XLSX and use the FIND-All function and search HALF A MILLION records in real time. And when you browse, it is showing the full path, and you can say "WTF is that one? Oh, yes, I haven't seen that in ages. " etc.

SO you can re-do the above every few months - and if you happen to use WIndows, you can use this command for the same result
>> dir /s /b > c:\temp\BooksIndex.txt
Obviously, change the output file & folder to suit you own quirkyness
Enjoy your meal, as they say in the USA
G

Glad you're happy - me, I'd stay in command line. Much easier, faster with a little experience.
Try "grep -i xanadu" to find all occurrences - pipe it to "less" to make it scrollable.
And try this to fix the date issue (watch the embedded space character).

Whatever cooks your food ....