We did the Lucerne extension in 2010 and we took all three of the optional tours. We did not go to Mt. Pilatus. Although we thought them to be rather expensive we did enjoy all of the optionals. I would rank Swiss Idyll #1, Kleine Shidig #2, and The Best of Switzerland #3. Were I to go again I would skip #3, probably in favor of going to Mt. Pilatus. But the cable car ride and the view from the top of Mt. Rigi, looking over Lake Lucerne, was about a spectacular as I could imagine.
Switzerland is spectacular -- expensive, but spectacular! Whatever you decide, go and have fun. You will not be disappointed.