I love where they're going with gnome3. I understand the frustration people have, because there are some places where it superficially feels like 2 steps forward, 2 steps back. However, if you use it you can feel how good the platform decisions seem to have been, and if you watch it improve with each point release you really get a feel that these guys are enjoying providing top notch Free Software again (gnome2 was stagnant). Also, if you want to use gnome2....just freaking do so.
OTOH, I see a lot of people saying they've switch to Mate, or Cinammon, or KDE, or XFCE, etc. Personally, I've switched to KDE and couldn't be happier. Good riddance to Gnome, as far as I'm concerned.
So every time somebody responds to criticism of what GNOME has become with "Well it has all been going swimmingly for me. The few wrinkles don't bother me!", I can't help but see myself, lying to myself.
While I haven't tried KDE in years, I'm sure the experience has dramatically improved and it is now a viable DE choice. Hopefully, in four or five years GNOME will be the same way. But really, there can be no defending of the current state of GNOME, nor the state of the early 4.x releases.
You forgot a third, important, group: those who can adapt to change and continue working. I would also consider grouping your two categories into one because most people who change their DE also complain endlessly (and quite loudly) about every other DE.
Unless you work on a desktop environment (as in "developing it, not developing under it") I doubt the time you spend considering its various virtues and shortcomings will ever pay off.
http://dl.dropbox.com/u/8403291/centos.html
You will need to do some fiddling with repositories, research yum-priorities plug in and the various additional repositories.
I have Ubuntu 12.04 with Unity on the laptop and find it quite useful on the smaller screen. Looking at the Gnome 3.6 development screen shots on the original article, I might hunt up a ppa and try it...
Those are two completely different roots:
https://upload.wikimedia.org/wikipedia/commons/8/8c/Gldt.svg
I seem to find that from an end user/desktop user point of view, CentOS delivers much of what Lucid/Squeeze delivered except no banshee (mono libraries not installed). I therefore point out the existence of RHEL clones whenever Ubuntu folk express concern at the shift from Gnome 2 to Unity or Gnome Shell when upgrading from Lucid.
Among the linux users I know, there are two categories. Those who change their DE, and those who complain endlessly about it.