I do use packing. I apply it on top of the pattern. It does lubricate the blade and helps eliminate burning and produces a smoother cut finish. If I'm cutting a thick, hard wood, I will even apply it to the bottom of the wood, with a blank sheet of paper between the board and tape. It really does work for me!
Some complain about glare from over head lights. I don't have that problem as I use a magnifier with a florecent bulb. Others complain that it's hard to remove the pattern and tape. It's easy to remove with a heat gun, or a spritz of mineral spirits in a spray bottle.
I'm not trying to change anybody's mind about what to use, just explaining what works for me!