The best teachers I know find great challenge in the human problem-solving: faced with 20+ people who don't all learn the same way, who all need different things, can you actually run a class that gives each one what they need?
Oh, try 133!
Yes, it is challenging work. Most of the jobs that I had before my master's degree, I learned everything I needed to know for the job within three weeks. Teaching is pretty intense. Grading is kind of soul-sucking, and there are many frustrations, but I never get bored. I do creative problem-solving all the time.
