A few years back, I taught some chess at my local club to kids after school. I am not a "Master" by any stretch, but I am solid enough. Anyway, we would get guys stopping by all the time, and invariably, they would all proclaim their skill by telling us how the beat their computer "all the time".
And invariably, we would sit them down for a game only to discover they were horrible. Why?
No take backs.
I am not saying these folks "cheated" when they played their computer, by taking back bad moves, all I am saying is that IF they do it, then they arent as "skilled" as they think they are.
So if you're a save and reload guy playing Emperor level, I would hazard to guess your actual skill around Prince, maybe. I can beat Immortal if I save/reload a lot, like huts for techs, battles that go poorly, etc. But I struggle on Monarch "playing it straight". So no, I dont consider save/reload cheating, I do call bullkitten on a S/L guy saying he "beats Immortal regularly".
As far as the others go, World Builder is just plain wrong. Play a lower level if you want to demolish the opponent that handily.
Rushing with any civ isnt cheating.
Pie is only cheating if you make it from a pre-made crust + canned filling. Thats just WRONG! And dont even get my started on buying a whole pie pre-made! Now, if you make the crust yourself, and make the filling yourself, its not cheating, but its still not as good as cake
EDITED NOTE about BLs "worker" bug. NEVER EVER group your workers! Give each one individual orders. I discovered I was wasting tons of "worker turns" by grouping them, because if one worker "finishes" its upgrade, the other wont be usable unless you ungroup them, and lots of times you dont even know it. (the other note I was going to make was already explained quite clearly by Wodan, good posting Wod!)