You know, it's funny... The drifting to the left is something most newbs are really puzzled by. I have to admit, it puzzled me too at first, but after I landed and took off about a 3 or 4 times, and noted it always happening, it just sort of 'dawned' on me what was happening.
I then went online, and looked it up, and found that I was right. It was the tail rotor blowing me to the left... After I realized it, I was like, 'Doh! That makes sense, duh!'...
I bet that once most people figure it out they have a similar reaction. That's what has always fascinated me about the physical world so much. Many times, the answers are so simple and just staring us right in the faces, but we can easily miss them...