Hmmm...I don't really agree. I agree it doesn't do to stress needlessly and try to read the entire Harrison's prior to intern year. However, if you think you're going to have much time to read as an intern you are WRONG, unless you do some cush transitional year. So I think that reading up on a few common IM topics won't hurt.
I really think that doing rotations in ICU and radiology could help a future medicine or surgery intern a ton. I mean, the ICU is just a different world, and if you get to internship never having spent time there as a med student, you'll be behind the 8-ball vs. other interns who have.
As far as radiology goes, being able to read chest and abdominal radiographs is just important for all those nights on call...
No matter what, though, you'll find a way to suck it up as an intern when you have to, assuming you have it in you (I'm assuming you all do!).