What a great post! I have a 6 year old girl and I often wonder the same thing. But you are immensely important to your daughter. Just you being there, carrying stuff etc means she feels safe. If she thinks you can protect her from falling boulders, you must be able to take on any one of the random monsters little girls worry about. Mothers are (usually) there more, due to the normal dynamic of Father going to work (Hunter Gatherer) and Mother staying at home (Nurturer). This remains true, even when the Mother does go back to work etc!

In short, both parents are important and never underestimate how important you are to your daughter, even if she does take you for granted sometimes!