As just part of the stretching warm-up we do about 80 falls. On alternate days we do what we call a rolling warm-up where the number of falls swells to about 120-140. Of this number about a third of the falls are of the high breakfall kind. During the remainder of class these numbers, for most students, typically come close to tripling.
We have a couple of fellows in their mid-fifties who participate almost entirely in these warm-ups. They appreciate the aerobic nature of this kind of warming-up process, as do all the students.
At local seminars you can certainly tell just from ukemi whose students are from which dojo. There's no hiding a lack of falling practice.
Its my view that poor falling skills limits the quality and intensity of practice. Why, then, would you skimp on ukemi?