I would normally say yes, because when we go with the dcs every year there are 5 of us so we can take almost a whole row so are always sat together depsite never paying for 'sit together'.
However me and dh taking our first child free holiday together in January and I keep thinking how awful it would be if we didnt sit together, or where I like to sit (aisle seat near the front).
We're not going at a peak time but I keep thinking that 2 random adults could end up being sat anywhere.
Its only £15pp, should I just pay it so that our trip starts well??