I'm an engineer getting ready to apply this cycle and I was sold a false dream a long time ago that I would be given some leeway with my GPA for having a very difficult major...it's not true.
I have gone to conferences and spoken to admissions people from a variety of schools and there are probably only a half dozen who have told me that they weight more intense majors differently than less. Most don't care.
I personally think it's messed up because, no offense to anyone else but, a degree in chemical engineering is a completely different beast than a regular science degree, but hey I should have known that when I signed up
All that being said, I do know that a lot of schools do PREFER engineers if you have the grades. I have a friend at washu and they have made it clear that engineers are a relatively large portion of the class and they tend to do very well...another person I knew at a school in boston told me basically the same. If you have the 3.8+ and an engineering degree then you'll probably standout, but if you're a 3.5, you're going to unfortunately blend in with the other 3.5 bio majors
Biggest benefit: I had a friend who went from biomed engineering to med school and he said the workload in med school was actually not as bad as engineering (and this narrative has been repeated to me a few times). Sooo smile! If you get in, it won't be as tough as what you just did! (unless you're not good at rote memorization)