As for me:

When I am doing a blitz run, and I am trying to perfect my movements, I do reload and try the turn again. I also re-fight battles if I think I can get a better outcome. I accept auto-resolve outcomes unless I think I can do a better outcome manually.

Otherwise, I don't toggle fog of war, nor do I use any other cheats. I have plenty of fun when playing the game, but I do it more or less competitively so I cannot allow myself to do real cheating.

I justify the reloading to fight battles manually during a blitz run because I could technically start the whole campaign over again and probably do a better job the next time on a lot more things than just one battle. It's more of a time saver than a cheat.

I am the most ruthless and evil exploiter, however. If the AI is dumb enough to hand me money for promises in diplomacy, is willing to trade provinces, or otherwise behaves like a nincompoop, I will slaughter the fools without mercy and I won't bat an eye at accepting an unfair deal.

I also am only slightly less evil than SitRethCir when Crusading or going on Jihad. I abuse every loophole except for the ability to attack Catholics while crusading, just because that one is a bit too sadistic even for me, unless they've been excommunicated. I just cannot bring myself to turn a crusading army, which was never meant to attack Catholics, against Catholics in good standing. They must be off crusade or they must be excommunicated before I allow them to kill fellow Catholics. But other than that, I have no morality whatsoever in my blatant and legendary abuses of the crusading system.

I draw an imaginary line between being evil and being a cheater. Shame on all of you... and stuff.

Actually if you aren't trying to impress anyone with your campaign mastery, what you do in the privacy of your bedroom with your computer is your own business. And I did not mean that the way that sounded.