The short burst intervals that you perform are not going to show a huge increase in calories burned while you perform them but, due to the intensity and nature of the workout, your metabolism will continue to stay elevated for 24 to 36 hours afterwards.
Traditional cardio, while it does have some benefits, will not give you this benefit nor the advantage of faster and more effective fat loss.
Plus, intervals are short! As busy working mothers, we just do not have the time to spend hours every week on the treadmill. Short burst intervals not only allow you to use your time more effectively AND boost your metabolism without the risk of losing lean muscle from long cardio sessions.
So my advice is to not base your success around this feature on the treadmill. You will get results simply by following the Fit Yummy Mummy guidelines and focus your cardio sessions on short, intense intervals to help you see faster fat loss results.