If you've never done a side project, I would definitely recommend the experience. That being said, the people I know who always have to have something software

If you've never done a side project, I would definitely recommend the experience. That being said, the people I know who always have to have something software and/or business related on the side are stretched thinner than anyone else I know. I've gotten the most mileage out of the extracurricular pursuits that have the least to do with programming - usually those around art or sports. When I have an interesting idea for a technical side project I pursue it, but when I was in a phase where I felt obligated to do so, it brought more stress than enjoyment.