As a counterpoint to this, I recognized that I didn't want to be in the OR was during M3 surgery clerkship...
I personally had a number of surgeries growing up, had shadowed an orthopedic surgeon as a HS senior, so I felt like the OR had a lot of potential. My school required a rural medicine block in the summer between M1 and M2, and I elected to do it with a general surgeon - had a fantastic 3 weeks, got to do a lot of procedures with a undoubtedly dangerous level of autonomy for someone a year away from taking Step 1 and starting clerkships. The newness of actually seeing patients in some sense meant that everything seemed awesome and so I entered my M3 year very much considering a surgical field.
...and then it lost it's luster pretty quickly in a number of successive steps. Step 1 came back and my scores were decidedly average (as in I scored at the Median, which was roughly 220 that year), so that meant it was going to be an uphill battle for anything competitive when combined with my decidedly average preclinical grades. Then I got to my surgery clerkship (1st one of third year), and got lucky in that I got the community hospital spot with the private practice group which was the cush rotation for the residents (as they got to operate a lot more with a ton more autonomy), and infinitely more OR time for me...and it just failed to capture my passion. I basically got to hop from case to case, spend most of my time in the OR, and while I didn't dread going into cases, it was more like a chore to see my 40th lap chole. It just became so boring to stand there scrubbed in, even when I got to do something beyond hold retractors. So I was starting to waver pretty good at that point, and then I moved onto my subspecialty weeks and it went downhill fast. 2 weeks of peds ortho was remarkable mostly for watching a former D1 athlete get ripped to shreds (ended up crying...from a guy who I know took a lot of abuse from his coaches during his athletic career) in Fracture Conference when he misspoke said a PA shoulder view as an AP. I knew one of the ortho chiefs socially and liked him a lot, but he was the ring leader and it was pretty brutal. And by that point, more and more stories from my classmates about surgical culture were filtering through our ranks. I wouldn't call it abuse but it certainly is an environment that is not for everyone. While I know I can handle a lot, it's not a set of circumstances where I thrive. The culture was enough for me to take surgery out of consideration and subsequently seeing what resident life was like back at the academic mothership cemented my decision.
And since that time, every time I've gone back to the OR (did a peds surgery rotation as a 3rd year peds resident, spent a week in the OR during a Peds Cardiac ICU month also as a 3rd year resident), or even on the anesthesia side (peds anesthesia month during residency, 2 separate blocks as a PICU fellow), my decision has been confirmed over and over that the OR was not the spot for me.