Stitch in the ditch is my most often used quilting method. I like the look of the pattern reflected on the back.
I try to remember to lengthen my stitch length to at least 2.8 but don't always. A longer stitch does move better through the machine. Also a walking foot makes a huge difference. Finally, if you match your top thread carefully or use a good neutral, even if you don't manage to stay right in the ditch, the quilting pretty much disappears anyway. Remember to start in the centre and vary the direction of your sewing.
I use the auto-lock function on my sewing machine every time I start and stop a row. What about others? Do you pull threads to the back and tie? Back stitch? I always worry about quilting lines pulling out.