It will similar to your high school class in terms of being idealized and non-applicable.

I think they are interesting courses to take and there are some great conceptual takeaways. I'm not sure how valuable for entrepreneurship economics would be. I would personally go for microeconomics for it's applicability to business. However, macroeconomics is still interesting in a broader (even political and global) sense though.

I don't know what you'd be taking as an alternative to economics, but I don't see why you wouldn't take them. I took both macro and micro in college. I enjoyed the courses and found them useful. As philphodgen pointed out... what you will gain from taking the course is the ability to think like an economist.