If you have the work ethic to get into Hopkins I am sure you can figure out how to shape your career the way you want it no matter where you go.
If I have learned anything in life, it is this: You get out what you put in...
If you want to skate by, by all means skate by and take the possible benefits and consequences. If you want to challenge yourself and proactively make things happen, by all means do it. It is these decisions, not the school, that make one successful. One school may push you in the direction of one decision over the other... one may make one choice a lot harder than the other... but in the end you can make whatever choice you want. This is why match lists change so much from class to class, because the students make their own choices.
No matter where you go to medical school, from one mid-tier to another to the best medical school in the world... your choices as a student are what will make you the physician, not the logo on your short white coat. JH may have more opportunities to do cutting edge research, sure. Loyola may have better opportunities to serve the community, especially since the jesuit mission emphasizes this, sure. But when push comes to shove, with some initiative and hard work, there will be very little holding you back from making your medical school experience what you want and need.
Take your second looks and know this... whatever choice you make, it is the right choice because you will make it the right choice for 4 years.
Good luck and I hope to see you next year