From the places I've rotated at, it seems to be about 50/50. That is, 50% residents were rotators, whereas the other half did not rotate at the program.
Of course there are exceptions, but this is just what I've seen (n=1)
I actually don't know how beneficial it would be to rotate at a heavy rotator program like Columbia. Of course unless you are the ideal superstar you'll probably just fit in with the other dozen co-rotators from what I heard. Didn't rotate through there so can't really give 1st hand exp.