Jeff,
I think you are absolutely right, having a driver will allow you to see more. I noticed one responder thought you might be concerned about time......seeing is not necessarily a time thing. It is the ability to ride along as a passenger and keep your eyes on the lovely countryside, instead of the road, signs, and other traffic.
Kate, I commend you for having a driver, especially if you wanted to enjoy wine tastings......and even though one of the responders questioned your ability to get "drunk" from a wine tasting, it is sad that some people do not understand that different people have different alcohol tolerance levels. ANYTIME, and I repeat ANYTIME, someone thinks it might be wise to have someone else drive, whether it be after just one glass of wine or three glasses, it is a GOOD idea. I sometimes get personally lightheaded even after 1/2 of a glass of wine. Different people react different ways, so it is always bad to assume anyone else will react the same way we do.
My husband and I hired a private driver in Ireland, and it absolutely made our trip!! Not only the comfort of having someone who was familiar with the roads and could tell us what we were looking at, but like Kate, we could point to something and ask what it was. He also served as sort of a tour guide, he shared info and stories about what it was like living in the country, and he surprised/delighted us with special stops along the way, after he quickly determined our preferences.
We also hired drivers for Southern Spain and Morocco..........we will likely hire drivers for any future independent travel. It is just more enjoyable for us.
So many people (including us) often take group tours for the ease of travel. Hiring a driver is a wonderful way to have that same safety net, comfort, relaxation, yet also have the flexibility to do what you want, stay as long as you want, and have a local "friend" in the vehicle doing the driving, handling the tolls, buying the fuel, providing the car, and figuring out where to park.
I'm glad Kate posted the info about the driver, and I will stick it in a file and save it in case we get back to Tuscany someday.
......and, again, not everyone is the same, but for my household, driving an unfamiliar vehicle in an unfamiliar country, with a different primary language only raises the likelihood of what is known as the 'rent-a-car fight.' (Now I will expect a flood of posts telling me we need couples' therapy....thank you, but we are happily married for multiple decades and we have visited all 7 continents with enjoyable travels that work for us. ) Why have the stress? Vacations are supposed to be enjoyable and relaxing....take away those potential triggers. Hire the driver if it will mean a more enjoyable, informative trip.
Jeff did not ask if it was difficult to drive, he asked if anyone had rented a car with a driver....let's focus on answering his question.