[corin_]

Not cheaper or more relaxed! Between my hotel and Porte de Versailles (the convention center) was literally one straight road, with a one-way system.

Was 15-20 minutes to walk it (Google Maps says 18min), under 5 minutes to drive in one direction, 5-10min the other (due to one-way road).

Metro was easy sure, 300m to nearest station, then 2 stops on one line to Porte de Versailles - but that takes fractionally more time than a taxi, and is less pleasant than either a taxi or walking. I think 5 nights in that hotel and I probably walked it 60% taxi'd 40% - don't think I used the metro once.

Overall however I agree with your praise of the Paris metro. That said, I've been to Paris probably every other month for the past couple of years, and 50+ times in my life, and use 90% taxis... because they're easier, because the cost difference to me is non-existent (company credit card) and because most of my trips to Paris are cramming in meetings and therefore time between them relaxed in the back of a car with my laptop out catching up on emails is much needed.