Huge maps, they are fun and you get so involved in the game, that it becomes THE game, you kinda remember your games, when you suceeded and failed.
Also, I like to have lots and lots of cities in the map, and this leads to, of course, lots and lots of units and even armies.
I like to plan large invasions, use large stacks of units, and so. When you are in a standard map, you usually attack a civ with 8-18 cities usually, but when you are in a huge map, you sometimes attack civs with even 20-32 cities!
But I have to admit, I was playing a standard map game a little ago and I loved it! It's fun to try all map sizes, and try to adapt your gameplay to them...