I dont know if you call it cheating, or comparative learning... but i have occasionally re-loaded a game 100 turns back and re-played the last couple of hours of gameplay.
this is usually at a junction in the game, where i chose one tech path/religion/course of action over a different one.
yes I guess I already have knowledge of the land, but by that time I have normally already explored the map. re-playing 100 turns with a different strategy gives me a good comparison between strategies.
e.g. i might play a builder game at the start, then at one stage re-load and turn it into a war-monger game. then see the difference in my progress. the war-monger approach ends out faring much better in 99% of the cases, thus this practice has slowly turned me into a better war-monger.
It also lets me compare how my game would turn out if i persue techs economics first, or go down the magic, or horse, or melee, or recon line. then i see the comparison of how my battles fare if i fight the same battles with advanced melee or with advanced horse forces.
anyway, this is re-loading, though i dont know if i'd clasify it as cheating.
I admit when i started i have occasionally re-loaded when i lost a hero etc in a 95% battle. and i think the only time i used WB was a long time ago when my holy city appeared in the lamest city with no future, and i re-located it to be in a more appropriate city. since then i have learnt to starve off the population of innapropriate cities before founding a religion.