I think that really I am a benevolent leader who is just misunderstood. I really love my people, so it's only natural that I would do anything at all to ensure the continuation and flourishing of that people. Sometimes it's kinda tough love, but I think they understand.
So yes, I race to Bronze Working and instantly enslave my people - for their own good, of course - and I will take my hand to the whip and not let it go for all the millenia until emancipation comes along (and even then maybe not). And if it does happen, you better believe there will be some serious mass burials the turn before.
Seriously, caste system? The only castes in my empire are whip-holder, slave, and cannon fodder.
Need axemen? Whip. Need granaries? Whip whip whip (to quickly get even more people to whip). People whinging or sick or just generally not doing much? Whip.
I rarely draft since it's not worth the anarchy and whipping with vassalage/theocracy works a charm anyway. Unless I'm spiritual, of course. And if I capture the pyramids, you'd better believe I'll spend the longest time running a police state. Although sometimes I'll grant universal sufferage and let my slaves cast votes just before I whip them to death because that's the kind of nice guy I am.
Right from the start, I'll be whipping conscripts into my army, clearcutting every tree in sight to arm them, and marching them off in suicidal rushes against anyone I can find. Even when there are massive tracts of prime land left unclaimed, I'd still rather build axes and let my neighbour build my settlers (and most of my workers) for me.
I will attack to claim land, I will attack to get resources, I will attack to get a couple of workers, I will attack to get promotions and great generals, but I will most often attack just to ruin a neighbour who looks to be getting a bit uppity and successful, regardless of whether the war directly aids me or not.
If his cities are tough, it just means I need to whip out a couple of extra cannon fodder waves to send to die gloriously softening up the defenders for my elite troops.
If one of them is extra tough, I'll just pillage it back to the stone age, take his other cities, sue for peace if I can demand a tech or two, then come back a few turns later with swords and catapults and finish the job.
If a captured city doesn't suit my needs, I'll raze it, even if it's a holy city half full of wonders. If I keep the city, I'll whip until I can barely lift my arm. Conquered civilians in my empire have an even lower life expectancy than catapult operators (those glorious martyrs!).
And when the war is over, peace will generally reign for just as long as it takes for my troops to heal up and get to the border with my next most powerful neighbour.
Nukes usually come a bit late for my tastes, but I am still rather fond of them.
Despite all this, I am often well-liked by a fairly large amount of the world, and I work hard to foster good relations.
I don't usually bother with vassals, since I'd rather wipe them out and save myself the diplomatic penalty that makes it that much harder to bribe everyone else into attacking each other and pointlessly ruining their economies.
I will almost never found a religion for my peoples' spiritual edification, but will instead cynically force on them the religion of my most useful current ally and then use it as an excuse to whip my people even harder. And if I happen to be in a three-civ religious "alliance" bloc with nobody else worth killing, I will send out heathen missionaries to convert one of my "allies" to a false faith while mouthing pious platitudes to the other to incite the two to war and then stab both in the back in turn.
My best friends are often Isabella and Montezuma, and we have kickin' parties with lots of sacrifices and heretic burnings and Montezuma always brings tequila so we all get plastered and wake up in the morning to find we've razed half of India to the ground. Somehow the invites to Gandhi's parties always get "lost in the post".
You know what's brutal? Forcing your people to languish in impoverished backwardness because you WON'T whip them and go slaughter all your neighbours so you can take their stuff. You monsters.