The only other voice I can think of with a similar gravelly charm to David Warner's was that of Alan Rickman (Severus Snape),
One can point to theatre background as a link - it brings mastery of the voice and familiarity with classic epics that must have helped actors like that (and IanKellen among others) to bring pathos to their performances.
Polish dubbing did something similar - somehow hiring polish theatre A listers for a big chunk of BG2 roles. They even managed to fight through what was at times a rather dodgy translation.
