In practice, at least at my university, this wasn't as big a deal as it sounds. A normal single-major doesn't mean you only take classes in one department. A

In practice, at least at my university, this wasn't as big a deal as it sounds. A normal single-major doesn't mean you only take classes in one department. A double-major typically means you use major A's elective slots to take the core classes for major B, and vice versa. The upshot is that as a double-major, after sophomore year I would have no time to take any classes outside of those 2 departments. Counter-intuitive as it seems, staying a single-major allowed me to take a much greater variety of classes.