Thank you for the links, Tod. The views look similar to what I remember seeing when we did this before, but I still don't recall whether we had to buy tickets to the Museums in order to get to the terrace view.
I do remember we walked up the long flight of steps (aka Michelangelo's Grand Staircase) that lead to Piazza del Campidoglio, thru the Piazza, and if memory serves, just kept walking to a terrace on the other side of the piazza that had incredible views of the Forum. We were up a bit on a balcony, not at street level....
It only matters in that I'd love to see this view at sunset again but know we will not have time for the museums beforehand due to our arrival time. I'd prefer to go to the museums on another day in the morning.