In 2011, Torvalds switched from using GNOME 3 to instead using Xfce. Last year he switched back to KDE. Now he has shared via his Google+ social networking page that he's back to using GNOME 3.x.
He says that GNOME 3.x has been improving and that when pairing the desktop with the right extensions, it's a rather pleasant desktop. He specifically points out Frippery and GNOME Tweak Tool as making a huge difference to his experience.
In his post he also calls out some GNOME developers as being in denial.
His post about switching back to the GNOME desktop can be found here.