Nor have I experienced any difficulties seeing or being seen with drops.

I suspect that many cyclists who express a preference for flat bars have never had the opportunity to experience and become accustomed to properly adjusted drop bars. More hand positions, better aerodynamics when at speed or running into a headwind, better weight distribution for slippery conditions, more efficient use of leg musculature. I have a severely herniated disk in my lower back and anything longer than 3 miles is pure torture on a bike with an upright position. With drops, I can put more of my torso weight onto my shoulders, arms, and hands - problem solved.