We have a Kia Rondo (no back seat tether so useless for kids in the carseat.... realized that AFTER I bought it!) My parents have a Journey (again no third row tethers).
Anyway - I think the buckets ARE useful with kids in carseats... because realistically even if we could put the kids in the back of our vehicles we would only change the carseats if we were going to be using the car for a few days - week. But if you have 1 extra adult to go to dinner it would be quite the hassle! (We climb in through the trunk to use our thrid row!)