much like bassdominator, i found myself enjoying my surgery rotation a lot more than i thought i would and preferred being in the OR over the wards and especially the clinic. anesthesia lets me be in the OR almost all the time and lets me avoid most of clinic (even surgery clinic was incredibly painful).
yes, the physiology and pharmacology aspects of anesthesia are fun and all, but i also liked the procedural, hands-on aspect of anesthesia in addition to the thinking and decision-making aspects. and overall the anesthesia attendings and residents seem more relaxed and seem to have more fun than the surgeons.
one of the things i really appreciated about surgery, though, was the fact that their craft has the potential of really curing someone. much of internal medicine seems more like management and control of disease, with not as many opportunities to actually cure the disease process. don't get me wrong, i like thinking and postulating about a problem, but i like being able to further utilize all that thinking and actually do something about the problem even better.