Or, for you that have spinners, which hand do you use them with? I have always thought the general rule was digital controls use the left hand, and analog ones use the right hand. Most games seem to follow that rule, but Tron seems to break it.
I usually use my right hand for the spinner (I'm right handed), but it's not one of my "need to be right" controls. I remember playing 2600 paddle mostly with my right, but I'd switch to my left for a round (kaboom!) to give my right a rest even on the high levels.
As for "standard layouts", there wasn't any at the beginning. The controls were new, so the players had not "learned" with one layout or another yet. Many games had symmetric controls.
Later, as more games went to 2 player with more buttons, the manufactures decided to go joystick left, buttons right. Players who liked the other way (like one of my friends back then) either had to re-learn, stick only to the older games, play cross armed, or ultimately drop out (like my said friend

). (The manufactures also liked trackball right, buttons left.)
Blastriods and OmegaRace also had the spinner on the left, buttons on the right. Many 360 degree wheel games had the wheel on the left, button on the right, although some had a p1/p2 "mirrored" layout, and they aren't the normal spinner game. *shrug*
FWIW, my spinner CP has the spinner in the middle:
button button Stick button button Spinner button button Stick button button.