yep, agree with all that. Lazy people won't enjoy a surgery residency. Laid back is okay to a certain extent, in that calmness and control is often a better way to handle a stressful situation than getting all strung out (but there are plenty of high strung personalities in surgery too), but being a hard worker who never tires (or at least never admits to being tired) is mandatory to do well in surgery residency.
Why is it so "hard core"? We are the only residency that takes call every month all 5 years vs. medicine/peds/etc where there are a ceratin amount of "outpatient" months where there is only clinic and no call. We are the only residency that covers floorwork, consults, outpatient clinics, and ICU patients all at once with the same team of residents covering all that. And, oh, yeah, there's the OR too, which is where you'll want to spend as much time as you can.
So how can you spend a good part of your day in the OR and still cover consults, clinics, patients on the floors and/or ICU's? - get in early and run your ass off all day. With the 80 hour week there's even more cross-coverage than before, so that, while it's nice to leave early post-call, someone else will need to leave post-call tommorrow and you'll have to likely cover for the work they would normally do while they are gone.
Forgot to mention that, although as you can tell we still do work pretty hard, most attendings and even senior residents know a system where they worked harder (pre-80 hours) so you'll always hear about how easy you have it now -yep, no room for whiners here.
But, we have fun, we like doing surgery, we like learning all that we learn by working hard and taking care of so many patients. So if you're a high energy person who likes to constantly be challenged, surgery may be just right for you.