In IM the culture is that, even if you are an intern, you are a doctor. By the end of the intern year, you get respect and your attendings treat you pretty nicely (as long as you do your job).
In anesthesia you are
just a resident, a glorified slave who can't do **** without her attending (at least in the eyes of non-anesthesia people). You may be disrespected by OR personnel and made fun of by surgeons. It's a culture where some surgeons are still kings, and the long-term OR staff are the royal court, and the anesthesia resident is about as important as the court jester. Your attendings won't really take your side; you are swimming with sharks every day, and God forbid you talk back to surgical attendings or OR "
mamas". Respect is not given, it's earned, the hard way.Also, because anesthesia is a hyperacute specialty, there is no time for niceties in (imminent) crisis situations, so expect your attending to literally push you out of the way if she needs to take over stat; that has also hurt some feelings over the years (not mine, but I have seen CA-1 mimosas report it).
The relationship with your attendings is not as tight as on the medical floors because you have a different one every day, and they barely get to know you. There is a lot of gossip; they (mis)judge you based on their own and other attendings' first impressions. It doesn't matter how much you really know; what matters is that you are low-maintenance, that you don't need much help, even if you otherwise suck as a physician (knowledge-wise). There is a reason CRNAs can function at least at the level of a CA-1; you are just a glorified stool-sitter and room setup tech. Some attendings will teach you way more if they like you, and cvasi-ignore you if they don't; because teaching is done on an individual basis (there are no rounds in the OR), you might get pretty crappy teaching while popular people will have a great experience. It's all a vicious circle that's not easy to break. If you get labeled in any way, you're done. It's a surgical specialty; you cannot learn it from books, you learn the most by doing, and you need more supervision than in IM (because you can do much more harm).
This is all OK and survivable if you are in love with the specialty. The hours are shorter than in IM internship (and longer than for IM residents), but way more exhausting. Also the learning experience is more intense and fruitful. Compared to what you get to do on a daily basis, occasionally IM will seem like a joke; you will be able to run circles around most medical/surgical residents regarding the acute care of really sick patients or crisis situations. They will beat you at chronic care.
As long as you don't expect to be treated like a PGY-2, but more like a PGY-0.25, you'll be fine. And the more time passes during residency, the more beautiful the specialty will seem. What you get to know and to do on a daily basis can be simply breathtaking. It's just not for people who can't leave their ego at the door or who want to be the center of their Universe.
For truly intelligent people who have trouble hiding it, the OR can be a really unhappy place. It doesn't take a genius to cut and sew, or to administer anesthesia in most people. Unfortunately, that's becoming something to consider in most specialties nowadays.