ido-with-filename.el

(require 'dash)

(defun wh/ido-switch-buffer-with-filename ()
  "Switch to a buffer with ido, including the filename in the prompt."
  (interactive)
  (let* ((bufs (buffer-list))
         (bufs-with-paths
          (--map (with-current-buffer it
                   (if (buffer-file-name)
                       (format "%s <%s>" (buffer-name) (buffer-file-name))
                     (buffer-name)))
                 bufs))
         (chosen-index
          (-elem-index
           (ido-completing-read
            "Switch to buffer: " bufs-with-paths)
           bufs-with-paths)))
    (switch-to-buffer (nth chosen-index bufs))))