If I may ask, for those that knot and bury, are you pulling up the bobbin thread then knotting the two together to bury or knotting them separately on the front and back? I usually pull them to the back and knot and bury together. Does that sound right?
Personally I have done both knot & bury and taking tiny tiny stitches, but sometimes I don't like the looks of the tiny stitches. I'm not very good a machines quilting yet though either.