FWIW, I wouldn't overthink the lack of exploration by early test-players, at this point at least. In my games, at least, I've keenly felt a shortage of luxury resources, which has really kept my growth throttled back. I find coin and happiness are very tight early in the game, and it is easy to lose scouts, so it just doesn't seem worthwhile. That may change if Europe is stocked with more luxury goods.
It's also true, though, that there isn't a pressing need to go looking for civs, for a couple of reasons:
1. No tech trading. You don't have to worry about being outside the "club" because you're not in contact with other civs. Also, most of the civs in my games haven't even had the coin to execute Research Agreements.
2. No trade routes (that I can find). Trade seems to be entirely an internal matter in CiV, so you don't have an incentive find big, distant foreign cities to goose your income.
3. No map trading. Meeting new civs is not going to open up new areas to exploit or explore thru map trading. You meet 'em, you get open borders, and then you have to make your own maps. This is even more tedious to do without road networks to speed things along.
That only leaves two reasons to go looking for new civs: Execute resource trading (which is a necessity, but on these maps many luxury resources are at a premium); and if you're feeling lonely and want to be buried under avalanches of "Let's you and me be friends and go beat up that other guy!" messages.
BTW, Killerkebab says his maps work with starting locations, and he has Babylon installed. My maps are four-for-four at launching with correct starting locations, and I don't have Babylon.