I used to fly a C210 in icing conditions every night in Northern California for a now defunct 135 operator. 10,000ft would start to accumulate ice, start pitching up and start descending against my will. The boots worked for crap, but luckily the temperature differential was enough a thousand feet lower to melt the ice, and the airplane picked up speed. I am lucky to still be alive.
With the two type ratings I have, the CL65 and 744, icing isn't even a concern when you follow procedures. I find the summer time thunderstorms require far more grey matter in deciding a course of action to take.