> Minifying your JS and CSS files is a very good practice as it's not only secure, but also is compact.
If you think you gain much in terms of compactness, you might not understand how the subsequent gzip compression works. ;-) There may well still be a gain, but it won't be significant.
As an example, on a previous project all of the javascript libraries + the app concatenated together at 3MB. Minification with uglify reduced the size to 1.5MB and using Gzip compression further reduced the transfer size to ~800K.
Have you compared that to the transfer size of gzip without a minification step? I haven't seen a real difference, myself, and I've been considering taking the minification step out.