Hi Dana... I understand your concern about your husband and I hope all goes well with his surgery. As far as driving, I only had a partial cystectomy (open surgery) and I was told not to drive for two weeks post surgery. His time may be longer because his surgery is more invasive than mine was with the bladder being removed. He is going to be pretty sore for several weeks.
Even though it may feel like it's not strenuous, any action of the legs and feet puts stress on the abdominal muscles where the incision will be, plus the internal sutures where things have been rerouted. It is vital that nothing gets pulled loose or torn internally.
Secondly, driving or even riding in a car for the first little bit puts one at risk of being in an accident that would traumatize the surgical area... even a minor one.
He will need to get over his "thing" about driving for a while. I understand that because I have a phobia about other people driving as well, but I had to rely on a trusted friend to drive me the 300 miles (483 kilometers) home from the hospital.