Why not a forest (or some specific places like a dungeon or spooky castle) where enemies/beasts respawn BUT only the first time you visit that place (with respawning) you gain the full XP you usually gain depending on your current level.
So but the second time (and more) you only gain 1 XP point per kill or even nothing so the balancing of the game is still intact.
Also "loot" is very limited the second (and more) time you visit places where enemies respawn (or even no loot at all?) !
Just gamers who like to fight more and gamers who like places that aren't never "totally dead"/"empthy places" are happy and gamers who don't love respawning simply don't visit such places more than 1 time per playround.
Even inserting a skill to make yourself invisible (like in DD or DKS) and pass unseen most enemies is a possibility I believe.
On 7th of february 2015 : I start a new adventure in the Divinity world of Original Sin,
it's a Fantastic Freaking Fabulous Funny ... it's my All Time Favorite One !
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