I use a paste wax intended for wood, such as Johnson's or Minwax. I would not use a paste wax intended for cars, because of the concerns over silicone contamination. I only have to wax a few times a year and it only takes a couple minutes. A can of wax will last for years. It just makes moving the wood around on the saw so much easier. Eventually, with use, the table's surface does get rough enough to impede the movement of the wood. I do the same with my planer, table saw, router table and bandsaw tables. I've not tried the wax paper or dryer sheet ideas. They sound interesting.
I try to remember to de-tension the blade when the saw is not in use. I do the same with my bandsaw. I just think it's good practice and certainly doesn't hurt anything.