Tom I think that taking close to 200 shots of a sunset makes sense. The light changes quickly as the sun dips below the horizon. You also mentioned that you walked around a lot in order to get different perspectives. I also suspect that you bracketed many of your shots. It sounds like to me that you carefully planned your photoshoot.
What you did was a long shot (pardon the pun) from those who fire off hundreds of frames, standing in one spot, in the hope that one or two of them come out looking good.
Graham From St. Augustine, FL. "I like photographers, you don't ask questions." Ronald Reagan to White House Press Photogs