Spoon- Back when I was guiding I had half right hand & half left hand casting reels in my boat for clients. It seems more guys prefered to use the right hand reels, and most were right handed thus maybe because they're an easier to wind for them? Or like you they perhaps learned that way? Long ago I was told that reeling righthand levelwinds became a broad tradition because bass fishermen mostly reel righthanded due to the critical retrieve rate importance, thus due to the greater numbers nationwide wanting right hand reels the manufacturers built way more right hand reels. I have wittnessed just the opposite with spinning reels; more guys reeling left-handed & don't know why. The only other reason I can think of for a right hand reel for a right hander is spreading arm fatigue equaly; fish right arm, retrieve left arm. However, I have always prefered the left hand reels so I could fish with my quicker reflexed & co-ordinated right hand while reeling in or letting out line for varying conditions with the left hand. And fishing in the boat I steer the tiller with my left hand and fish right handed, thus the left hand reel there is almost a must for quick adjustment effeciency (such as during backbouncing).