I've never really liked Gnome much, you might want to try some of the other DEs out there, especially since Gnome is pushing a whole new interface in a few months so you'll have to learn new stuff anyway.
It drives me nuts when I switch applications with
alt+tab and get jumped to another space.
That's an option you can turn that off in the Expose/Spaces Preferences.Now there's single-app mode, which I take as a tacit acknowledgement that real maximization instead of "zoom" was a good idea after all. How long did that take, again?
I really really want to like OS X. It does so many things right (focus-stealing, DnD, and copy-paste among them!) It's just so painful to use after having a real WM.
[edit] For reference, I use Openbox; the listed features (except for tiling/tabbing) are what I use everyday. I expect the awesome/ratpoison crowd has slightly different but no less valid criticisms.
The maximising the Window thing is a tacit acknowledgement that you're not actually using the full potential of your desktop as a multi-application environment. :-P
If you want to bash a Windowing system that truly deserves it, bash the one from Windows! OS X isn't perfect, but Windows is really really bad. Except for Windows 7, which made big improvements (aka copying OS X) and is now merely really bad.
I'll give you that Linux has a few better WMs than OS X. (I'm particularly fond of Openbox myself, and was always excited about the elusive 'Enlightenment e17'.)
However, I cannot accept any claim that X is better than Quartz.
His comment is fair considering the parent comment was confusing about why it took so long to get spaces (an aspect of window management) because of elements of the windowing system.
Regardless, his use of Window Manager and System are fine within context.