It's strange, when developing C# and the like I'd go crazy without a debugger... and yet, in Python I've hardly ever used one. That might be because it's hard to develop C# without already being in an environment that puts an emphasis on easy debugging (Visual Studio), whereas I'm developing Python in whatever text editor I happen to be using at the moment and never really bothered to try out anything other than the IDLE debugger -- which really isn't that great to use.

Might be worth it to set up a better environment, then. Somehow I don't feel like print debugging is all that inferior though; in a sense it might actually make your debugging more efficient by forcing you to formulate concrete 'questions' about your code before even diving into the execution.