I am using WP Minify with great results for JS and CSS. However, my site displays some content which, through CSS whitespace:pre-line, forces line breaks. When I enable WP Min, even with HTML minification disabled, all the HTML source is removed of white lines. Meaning, it is not minified per se, it is still indented and all but no line breaks or empty lines in the code, which makes some piees of my content look odd.
See for instance the Synopsis block with and without WP Minify: