A lot of your concerns have been addressed in Uber's "Elevate" study [1]. For noise, they're targeting at most half the noise of a truck, at most 1 dB increase

A lot of your concerns have been addressed in Uber's "Elevate" study [1]. For noise, they're targeting at most half the noise of a truck, at most 1 dB increase in the day night level indicator (DNL), and a maximum 5% increase in nighttime awakenings. As for efficiency: a normal car does about 1 mile/kWh, an electric fixed wing about 2 mile/kWh (thus, better), though VTOL would increase that by 50% or more, an electric car about 3 mile/kWh. So, could be quite feasible, and a lot of the groundwork is being done. [1] https://www.uber.com/elevate.pdf https://www.uber.com/elevate.pdf