I worked on a Symbolics machine for a couple years.
Everything, everywhere, at all times was "active".
You could click on anything.
You could "drill down" all the way to the code running on
the hardware (which was a lisp machine). If you made a change
somewhere in the call stack the change automatically propagated
to all relevant things including recompiling. It was more like
"a living thing" than a computer.
All of my AI, Expert Systems, and Computer Algebra work was
done on a Symbolics.
Unfortunately I never got to touch any of the "west coast" systems
so I can't compare.
Tim