Two points regarding DE:
If your ultimate goal is Law or Med schools, don’t take DE classes casually. The grades will count as part of your GPA for admissions to Law, Med and possibly other professional programs.
In terms of being a boost to college admissions, not all DE is created equal.
To give an extreme example, college admissions officers will not be as impressed with a high school kid getting an A in Calc at a local community college where the average SAT is 900/1600 as they would be with a HS kid getting an A in a class like Math 1207 at Columbia or Math 25/55 at Harvard.