Sanford airport is over an hour away from Disney without traffic; that’s why car service is so expensive from there. They have to pay the driver to trek up there and back.
While Uber and Lyft are definitely an option, and drivers do watch the flight schedule for fares, it can still get fairly expensive with it being about a 50-mile one way trip, especially if surge pricing comes into play. Also, due to the small number of flights that come into Sanford daily, rideshare availability can be more limited, as there are fewer drivers in that area to begin with.