I agree once an hour is excessive.

BUT, my experience when doing the switch is that the children upfront are far more disruptive to the cabin than my husband & I switching seats, particularly since we make sure to have aisles.

Both times we did it there were toddlers running up & down the aisle in BF, and my last flight, a kid in the seat behind me kept on kicking it... on the HNL BF flight, you have to really try to kick the seat And no, I didn't say anything.