No, they were aimed at the system utilities eg. system-* that present UIs. They weren't tied to a DE (but did use a specific windowing toolkit like GTK+); I am not talking about the control center or Kontrol system - I am talking about the system-* UI packages which were all Python written, with bindings to GTK+ and ran horribly.
At home, I use KDE, so of course they're not going to have system utilities binding to GTK. KDE is Qt-centric, so most stuff there is most likely in Qt-flavored C++. Xfce is GTK, but it's known to be fast (I use it at work and it's quick), so I seriously doubt it has system utilities in Python.
Honestly, I think all your complaints are really about Gnome3.