@fatboy Most GUIs get in the way of productivity; more designed for the common user than designed for any level of use.
OS/2's WPS has been the only GUI I was comfortable in using full time. Of course, it was fully configurable.
I've never been comfortable with Apple's GUIs (too restrictive). Microsoft Windows is just awful (always needs cygwin with X loaded). I find Gnome useable, but Linux has always been a command line first OS. The Linux GUIs are steadily improving, but...