I absolutely love my walking foot! When I was new here to the list that was one of the first recommendations made to me by TWMBO (those who must be obeyed- kind of like the wizard of Oz of the group- they are out there, but we can't always see them). It made my quilts SOOO much BETTER!
I use it for those straight seams and putting on the binding. Great investment- makes the finished product so much nicer and your mood will be too!