@technomancy: It's working pretty well, except for one unforeseen problem: my dir names begin with digits after they are renamed and apparently, there is a "conflict" with the timestamps and all preceding them (at minimum, my dir names are not correctly highlighted anymore, since the digit part of them appears like the dir's timestamps.
I guess I have to get the dir appear in the buffer without the metadata. How do I do that?
@legumbre. I had figured that dired-do-rename-regexp only worked for files. So I guess you do do a query-replace-regexp to on a dir with that feature?