I always found the actual challenge to decide what to get rid of once the duplicates where found.
Some tools I tried would also ask file-by-file, which I found a bit useless for thousand of files. Yet, I cannot even express a set of rules to decide this in general, so I’m not blaming the tools.
In particular, with picture collections I also came to the conclusion that some redundancy is probably ok rather than accidentially deleting data that I duplicated on purpose and simply forgot why.
Hey, I changed my desktop background and color theme… but yes, customization for me is copying all my scripts to ~/bin and set a keyboard shortcut to open a terminal. I’m-old-Gandalf-meme around here
edit: yes, .vimrc as well