I enjoy every step of making a quilt. I pin the sandwich together, on my glass topped dining table. I would never be able to do it on the floor, I don't get how to do it and my knees couldn't do it either.
Instead of SID I have done( although not alot) sew about a 1/4" from the seam line using the walking to keep the stitches straight, I much prefer FMQ, I try for perfection but after lots and lots of quilts they are not perfect. I just like a large stiple.