No matter what unit you choose, it's unreasonable for some purpose. For electrochemists, a coulomb is only 10^-5$10^{-5}$ moles of singly-charged ions, not much. But for electrical machinery, coulombs/second (amperes) is a practical unit. The circuit breakers in your house trip at modest numbers of amperes.
These SI units are common in engineering, but there are other systems around. You might find ESU or Gaussian units more comfortable for electrostatics.
