They appreciate it tremendously. This can mean the difference between getting invited back for another show and get blown off for another band. Leave mic cables loose on stage. I don't know how many times I have had to use a different mic when having problems with a wireless. If the cables are taped down I can't get back to my keyboard and guitar.
Less effects is best.
This elliminates failure points in your system and makes it easier to figure out problems. Run cables out of the way. If you have cables that will be near the audience put them in places where they can't get stepped on. It only takes one cute girl in high heels to put that heel right through a snake cable. Adjust your sound to the size of the crowd.