My family has used the airport Minnie Van service twice pre-covid and loved it. Post-covid we tried two other reputable car services, not ride shares such as Uber/Lyft. It could have just been bad luck, but we had negative experiences both times. Our first experience had a very non-personable driver, almost angry and our second experience had a very nice driver but completely unsafe, he texted while driving with two children in the car and almost got into an accident.
Over the years we have continued to use the Minnie Van service at times such as going from the Resort to Disney Springs and to/from certain Resorts for Dining. Most of the time our trips in Minnie Vans has been amazing. The Cast Members are always very safe and very personable. They interact with the kids; they have Disney music and shows playing and almost always have very interesting Disney facts and trivia to share with us.
I will totally agree that you pay a premium for it, but we have always felt that it added to the magic of the trip. For longer trips we now rent a car, but for shorter trips we do not. We would definitely consider paying the premium for the airport Minnie Van service, but again that is solely based on our families experience.