No offense, but you have done an admirable job of planning the trip from hell. If someone were to offer me that trip for free, I'd have to decline. hard to believe that you have two other travelers going with you that also think living on a train and packing/unpacking every day seems like an ideal vacation?!
Hopefully, you have time to change things?
Here's an example that limits wasted time travel and allows you to see (and remember) much more than your current "itinerary" does:
day 1 Land in Zurich / drive to Lucerne (maybe an hour or so)
day 2 Lucerne
day 3 drive to Dijon (3 hours). Spend the time here taking day trips around the Burgundy wine country - lots to see!
day 4 Dijon
day 5 Dijon
day 6 drive to Paris ( 3 + hours, drop off car)
day 7 Paris
day 8 Paris
day 9 taxi / train to CDG for return flight
Yup - driving is the ultimate "flexibility of unlimited travel". Getting a car for a week, even with the surcharge of dropping it off in a different country, will be $800-$900 max. You've really only had to travel twice (Zurich to Lucerne doesn't count) and probably spending less than 1/4 of the time traveling, saving $$ in the process, and, you get 3 nights IN Paris (not one night at the airport....sacrilege. ).
I apologize in advance, as you were simply asking about the pros & cons of rail passes! But, as you can see, your itinerary derailed my response to that!