I have seen the future
Now, I've seen Gnome3 before, and it is unusable -- at least on X60 hardware. So I went directly into Mate, hoping to see friendly Gnome2-like desktop. Well, it look familiar but slightly different. After a while I discovered I'm actually in Xfce. So log-out, log-in, and yes, this looks slightly more familiar. Unfortunately, theme is still different, window buttons are smaller and Terminal's no longer can be resized using lower-right corner. I also tried to restore my settings (cp -a /oldhome/.[a-z]* .) and it did not have the desired effect.