And why would you need gparted? Who modifies their disc partitions on a running system? That's something you do at install time. If you think your disc needs may change, use LVM (logical volume master) instead, so you don't need to worry about the actual partitions. I don't know what this guy does to create "botched multiboot set-ups", but I can't remember the last time that happened to me. Heck, it's been a few years since I last bothered with multiboot.
Since the invention of blackbox, which provides an all-in-one replacement for most of coreutils and various essential admin utilities, I don't believe there have been any truly essential apps. It all depends on what you're doing. A DB server is different from a Web server is different from a Mail server is different from a desktop is different from a phone.
Even for a desktop, the only thing on that list I even have installed is LibreOffice (the new, improved, version of OpenOffice). And I rarely use that. And from what I've seen of the others, I'm inclined to ignore the whole list. I might check out SMPlayer, though, but only because Lord Emsworth recommended it. Not because of what El Reg said.
Checking...nope, it uses the Qt libraries, and I don't want to bother installing any of those. I have more than enough gooey libraries already. Qt is only worth it if you're going to install KDE, which I have zero interest in.