One of the most interesting aspects of flying to me is that there is always a next level to adapt to.
I remember that when I went from a 152 to a 172, I just sat there and looked at "all those instruments" That was daunting, but didn't stay that way. Then I got into a 182 and had to handle all that power. Now the 182 seems like riding a bike, which is not to say that I'm a great pilot, just that I'm ready for the next challenge - of which there are many.