I fly DTW-YYZ quite often (< 40 min flying time) and they never do cabin service. Sometimes the lone flight attendant will come through with a water bottle and cups but usually will remain seated.

For that length flight, especially on a bigger plane, I would consider it usual.

Almost all of my 100 flights last year were 2 hours and under. Only the <50 min flights (probably 250 miles and under as the poster above noted) didn't have cabin service.