I must have adopted Directory Opus after version 5, so maybe I don't know what I'm missing. DO is at version 11 now, and I absolutely adore it. It's the first thing I put on a new Windows system.
I keep meaning to buy it to give it another go, I lost touch after 5 but kept revisiting their website for some reason. Like going back to an ex's facebook page to see what they've been up to.
Windows explorer, the Finder, Gnome/KDE/etc. are all appalling. Maybe I'm gonna go back and look at that website again... sigh