I don't generally use anything, but occasionally use packing tape for really hard woods like bubinga, jatoba or ipe. When I do, I find the light reflects off it and makes it harder to see the line, so a quick sanding with a sanding sponge helps. Also, my dust collector seems to have a harder time when there's tape.
It's a bit harder to do and keep the pattern flat, but I now put the packing tape on the back of the pattern, then spray and attach it to the wood. Part of the reason you get sawdust under the pattern is because it's not completely flat, or attached firmly enough, and it raises a bit when you drill the entry holes. Just my thoughts.
Nancy