Quite possible negative. For many people it can easily be a net negative to be driven around rather than driving one's self simply in terms of how you feel afterwards. All else being equal, I'd prefer to drive than be driven. Sometimes not all else is equal, like parking is hard, or I'm taking a trip and need to leave the car for the wife, and then I take a taxi or Uber or something. But I would assign a value of something like $50/hour to not being in a taxi/Uber.
I prefer driving, but am ok with being a passenger in the right car with a driver I personally know (i.e. my driver, vs. even a random guy from the motor pool, and certainly not UberX or a black car/taxi driver). For me I'd pay $50/hr to drive on a great road, $20 for most roads on e.g. the Peninsula, $0 for stop-and-go or SF anytime, -$20 to have a meh driver drive me around (black car or great uberx) or a very luxurious or empty train; $0-20 for a great driver I know and trust, -$50 for most taxis or a slightly crowded train, and -$100 for Thai taxis or public transit on wheels.
