We did lose a lot of time in traffic and yet the guide insisted on driving back into Athens to stop for a few minutes near the Hard Rock Cafe and some other shops. Too late and not enough time anyway.
Here are our the cons as we found them. Day one we visited a mosque and the Antiquities museum. One of these should be dropped if not both. There are some very interesting items at the museum and more time there might have been nice, but why put that before going to what people have really signed up to see? After lunch and checking in at the hotel, we headed to the sound and light show. The problem was it was not dark enough when it started to see any of the projections, so for the first half hour it was just a sound show. The good thing was, you got to see the sphinx and the pyramids in the background. But after that (now 7PM after a 6:30AM departure from the ship) we still had a stop at a Papyrus making demo and shop and a dinner cruise. While we thought the Papyrus making stop was interesting and nice shopping, but at the end of a long day was not the best time. The final stop was a dinner cruise on the Nile. Everyone was very tired, the food was very average, the entertainment was the same and there were no views to speak of from the boat. Our group was slowed by low mobility travelers which we likely be someday, but we hope they will group us only with similar passengers so we do not slow down others.
Important Note: Beware the vendors at all of the sites in Cairo. They are very in your face and do not relent easily. They have many tricks that your guide should explain to you how to deal with.