Fedora 14, then CentOS 6
After trying out Gnome 3 in both Fedora and Ubuntu, I came to the conclusion that their default interfaces were just plain awful compared to Gnome 2 equivalents. Hence, I stuck with Fedora 14 for quite a while and then jumped to the "obvious" long-term haven for Gnome 2 users - one sadly not mentioned in the article or comments - namely CentOS 6.
For those not in the know, CentOS is a free clone of Red Hat Enterprise Linux and, like its RHEL parent, has 10 years of free updates! Yep, that means GNOME 2 (and the OS itself) will be supported until an astonishing 30th Nov 2020, which for unheard of for any free OS.
CentOS 6.3 gives you a mature Gnome 2.28 experience, Grub 1 (far easier to use then Grub 2, IMHO), good old System 5 init scripts (which are being phased out in Fedora) and a rock solid kernel that has had a lot of Red Hat testing. As a "serious" free desktop, it's easily the best out there.
Yes, I've installed Firefox beta (that can be updated within the browser's About box) and also occasionally download an update to LibreOffice (I hate their packaging - over 50 RPMs and you often have to uninstall the old version first manually because of stupid package naming!), but there's very little maintenance otherwise (a yum update from time to time, but even that can be automated). It is literally a desktop that "just works".