Usage:

    (progn
      (require 'cl-lib)
      (require 'dired)
      (require 'my-dired-hide-details-mode))

Press `(' in any dired buffer to toggle details.

Other than dired-details by Rob this implementation does not use
overlays but text properties which is a lot faster.

I just wrote this a few minutes ago but the code seems to work fine with
dired, wdired and find-dired.

If there is interest, I can polish the code, add documentation and
customisation options and come up with a full patch for the trunk.  I
think, due to the way my-dired-hide-details-mode is designed, it would
be best to add the code directly to dired.el - that is

    add new code to dired-insert-set-properties
    add new minor mode dired-hide-details-mode
    bind dired-hide-details-mode in dired-mode-map

It would be necessary to fix a few bugs find-dired as well.  Nothing
fancy, though.

WDYT?

        Christopher