Do you own a blind hem foot? If so, then you own a perfectly respectable, multi-tasking, stitch in the ditch presser foot. Of course we quilters and don't do any hemming - if we can help it!
Mine looks like this:
It has a vertical metal piece that runs through the middle down to the fabric like this:
To use it - guide the little vertical metal piece along your seam line (or in the ditch) and voila! Stitch-in-the-ditch simplified! No tugging on your fabric necessary, because that little curved piece right in the middle of where your needle goes through pushes the fabric over for you.
It almost looks like a piece of wire running through the middle in this picture: