The EM guys at my school also consult everything... even ridiculous stuff (like simple bacterial vaginosis).
One must realize a couple of things though:
1. These specialties (e.g., OB/GYN, medicine, surgery) are readily available. Some expect to be consulted.
2. It may be a liability issue to not consult these services on some things, even if the EM physician can handle it. A PGY-1 in surgery with only 6 months experience actually has more surgical expertise than most emergency physicians. A PGY-3 definitely has more expertise than any EM doc since they concentrate on nothing but surgery, whereas EM physicians concentrate on everything.
3. Things work differently in a community hospital where there are no residents nearby. For instance, where I used to work as a paramedic, the EM physician handled everything, including trauma. The attendings were consulted when they were needed. Basically they were consulted for admissions or procedures (e.g., surgery). The EM docs did the central lines, full workups, etc. Where I am at now, the EM doc frequently doesn't even do a full workup. Why bother if you have residents in house? Afterall, they need to learn to work these patients up. The EM doc is practicing at a teaching institution in these cases.
There is one thing that I have gathered throughout my third year rotations. EM physicians are trashed by nearly every specialty, primarily because they consult the residents for mediocre stuff all the time.
It's a double-edged sword. Consult them, and you look like an idiot that can't handle "simple" things. Don't consult them, and you not only deprive the resident of an education, but you also run the risk of being liable for not consulting an in-house specialist whose only job is to deal with situations that you are treating.
My question is what do places with EM residencies do? My school doesn't have an EM residency. I'm curious if they also consult like crazy. If so, then the EM resident is getting robbed of an education unless he or she maintains an active role in the patient's care after being consulted.