Yes, the hand signals gets a little tricky when waiting to make a left turn at an intersection. I still have one bike without turn indiactors. When I'm in the left turn mode on it I find often find the oncoming drivers looking at me for some kind of indication of what I am about to do. These are the good drivers, more often drivers just plow on thru with no idea you are even there.
When a "Good" oncoming driver is attempting a left hand turn and so am I, it gets bad. He or she is making great eye contact with me, their face like a giant question mark, but I am busy with the clutch, so I instead of hand signals I make violent jerking motions with my head and neck in a leftward direction. I'm not sure if the other driver knows what I mean, but I have brought laughter to many drivers!