Randall, every time you post, it makes me at least try to enjoy late game combat more, but in all honesty I can't give a good analysis on late game units because at that point I'm actually just trying to finish the game as soon as possible, because I find the late game in civ V just downright annoying at best and torturous at the worst. And I try to stay out of late game war mostly because of the chance that one of my enemies will suck the fun out of the game by nuking my army and nuking his army which was right next to mine

, or just nuking one of my cities, or at least in one fun game where I had captured an enemy city-state ally, he then proceeded to nuke it, and then for peace I gave it back to him

, and that was at immortal or emperor even, (i don't remember which) and since the last patch too.
My opinion here is very honestly biased towards all of this, but I never have understood why so many people hate the Panzer (or in general cavalry upgrade class units), they work fine in actual combat where you're killing more units than you are taking cities, you can easily use tanks to take down units that have already been weakened by your infantry or artillery, it just seems that people want them to be fast moving infantry units.
Regarding aircraft, i have to be honest I've only built the B17 in a few games, and I have only had rare chance where I've actually let the game continue into the industrial as Japan

.
In summation I just simply get annoyed by many aspects of the late game in Civ V, which for me is eerily reminiscent of Civ IV warlords or vanilla, Civ V needs a rehaul of the late game akin to BtS for me to find it enjoyable. But in striking contrast I find Civ V far more enjoyable in the early to mid game compared to previous civ titles IV and even III. In BtS when I get assembly line/railroad and start mass industrialization, I say to myself "Oh! Now the real fun can begin!!!" in Civ IV i say "Well.. let's finish this up quickly, the enemy will have nukes soon" and the standard city build up doesn't seem to change much. But ultimately this is all subjective to my experiences.
And just to be clear, I respect the way you play Randall, and indeed many times I've read your posts and said to myself "Wow, that sounds like fun, maybe I'll try that in my next game" but ultimately I find myself playing huge marathon games as China, Spain, Denmark, Greece, or England, and massing myself huge overseas empires and then winning the game either by science(less common) or domination in the industrial era. I just don't seem to have the patience to hold off on attacking it seems.