I am not sure what you mean by 'worth it'. If you mean financially it can be quite lucrative. I took off work for several years when my first grandson was born, and I had more calls to sub than I had days to offer.
If you mean is it a headache...some days. Some days you have classes that are challenging.
It is a great way to find out if you want to be a teacher.
It is also a great way to learn so much more than in any class that you ever it...it is fabulous OJT (on the job training).