If you mean "traditional" like all classes to do 24+ hr call for all rotations, agreed, but otherwise, I don't think it's that rare; I think many places do a mix. For us, Medicine is still traditional call for upper levels. The second-years take turns doing 24+4 hour shifts throughout the month. Interns, who aren't allowed to work that long (in ACGME residencies - interns CAN take 24 call still in AOA residencies) take 14 hour call with their second year, go home to sleep, then come back the next day to do the post-call work along with the third year. There is a night-float intern who helps out with admissions overnight, working most nights of the week with whichever second year is doing their 24+4 hour call that evening.
Our surgery, OB, and ICU rotations are more of a mix. During the week there are day shift residents and night shift residents who trade off every 12 hours. On the weekend (either one or both days depending on the rotation) an upper level steps in to take 24+ hour call to give the other folks a break and a day off for the week. Our ER rotations are exclusively shift work without any 24 call (longest is a 16 hour shift occasionally during intern year.)