There are a number of mods that slow down a battle by lowering the lethality of weapons. Men kill each other slower, meaning fatigue can really show itself. Fighting just a little while will drop it to winded and tired.
You should be joyful that a game such as this is so long! Rarely can you find a game that you only spend a few bucks on but has such high replayability. Also, don't feel compelled to finish your faction's victory conditions, go try out a new campaign with a different faction. Heck, I never even won a game before.
You're right about forests not having any sort of effect on chariots, but there's also a hidden trait associated with losing combat effectiveness in said battles. Mounted troops lose either attack or defense, I'm not sure, when fighting in forests. Certainly you'll see that archers simply hit trees with their arrows rather than the enemy fifty meters away. So there is something to be said for forests.
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