I usually do. I attach my binding by machine, and when I hit a corner I usually go a few stitches down the new direction to tack it down, then reverse back to the corner, switch to a very narrow zig-zag and stitch over the miter to the corner and then reverse and stitch backwards back onto the quilt, pivot, switch back to straight stitch, and keep going.
It would never pass for a judge, but for quilts I give away to friends and family it works great - fast, efficient, and secure. My thread usually matches my binding so it's not very apparent either way.
The only quilt I've ever entered into the fair, I did not sew the miters. I attached the binding by machine with a decorative stitch and left the corners alone. I won a 4th place ribbon, which I did not expect. But it was the local county fair, not a quilt show. I expect an actual quilt show would be more picky, when awarding ribbons.