Hey David,
LOL, not sure why I would mind!  Seems like great questions to be asking.
"I seem to fumble around trying to get a gradated ND filter to work right, so would prefer to do so in PP."
I am not the person to answer this question.  I try as much as possible to do things in camera.  While I am still developing my technique with my ND filters (Singh Ray), I feel that I have become at least competent with them.  I use them both hand held and with my 4x6 filter holder.
James
PS Thanks to all for the answers.  I was at the Watchman tonight near the visitor center.  Tomorrow AM we will be at the museum for sunrise.  I hope to do the Watchman again tomorrow.  This time I would like to find the location that David shared.  Great composition!!