As a parent of 2 year old twins we are well aware of the looks that we get when we are in the boarding area and then when we are on the plane with the two car seats. It is important for my girls to be able see thier grandfather and be with the family on special events.
With the two car seats, we are stuck with being in the middle and window seat (most of the places we fly are serviced by 737, A320, 757) and are unable to sit together (since you can't put 2 car seats in the same row). If I had miles, upgrade certs or money to upgrade I would. We have the same right to be comfortable and having kids should not force us to the back of the plane.