I grew up with DT friction shifters. It's just practice. You'll get there. Make sure you aren't putting a lot of weight on your hands when you reach for the levers.
Like someone above mentioned, a benefit is that you can adjust it and not have the chatter. My mountain bike was my first experience with indexed and the chatter was something I had to get used to. It's hard for me to tell if my shifting habits change between the two types as my mountain bike has more gears than my road bike and is a different type of riding. I just go by feel. If I need the gear, I switch to it.