It depends on what you want to double major in. If you want to double major in 2 business majors, like accounting and finance, it’s very doable and only requires a few more courses than a standard degree in some cases. It’s also doable to major in something in Kelley and minor in something else if you come in with a few credits, take a couple summer classes, or just take a slightly bigger load.
But double majoring with one major in Kelley and one outside Kelley would take a ton of extra classes and would be virtually impossible to complete in 4 years in my opinion. There would just be too many required classes.
Also, I disagree that an undergrad degree from Kelley does not get you far. All majors at Kelley lead to an average starting salary of at least $50,000, and some even get up to $65,000. The majority of these students do not have a double major. If you want to do more than a standard undergrad degree, Kelley also offers solid graduate programs.
https://kelley.iu.edu/UCSO/Statistics/salaryStats/page40582.html
I don’t know a ton about the informatics classes, but one of my friends from high school said that they do not require a ton of work.