I've been using the "big and small" continents maps, mostly, with islands mixed in, and with "snaky continents" selected. This gives you lots of long, skinny, winding continents. I have modded the mapscript a bit to be bigger than usual, since I like to play with all 19 civs on one map.
Lately I've been thinking of trying to mod this mapscript to produce one extremely long winding continent. This nearly happened basically by accident one game I played - 16 of the 19 civs were on one continent, although I had explored almost the entire world before I realized that two "other continents" were actually connected to my continent. If you put everyone on one continent, it becomes a bit like the "lakes" mapscript, but with more chokepoints, with navigable oceans instead of navies being mostly irrelevant, and with some side islands for later expansion possibilities.