In response to two posts:
Overlapping tiles is a big advantage for novice players. The benefits are increased gold and shields from using the improved tiles of the capital, easier to connect with roads, one turn response time with warriors. Many novice players lose because one of their early cities gets conquered or sacked by barbarians. By having cities within one turn of each other, this will not happen. With two cities near the capital, the capital can still grow to full size, but the suburb cities may have to stop at 12. Size 12 cities are good in the late game when dealing with war weariness.
As for research, another response already noted that huts never give the tech currently being researched. By researching the cheapest techs, a player is more likely to get a more valuable one. Also if the capital is on a river and research at 100%, Ceremonial Burial may be only 12 to 16 turns and Pottery 16 to 20 turns. Other techs are more like 36 or 40 turns with 3 beakers per turn, so it is best to save those for later when there is more gold.
Most people that read about the dense build do not like it. Most novice players that try it are impressed by the early production and research. After a player gets the hang of the game and no longer feels any chance of losing on Monarch difficulty, the player can find their own style and discard my suggestions. I believe most novice players can give their early game a tremendous boost with my suggested strategy.
The strategy almosts guarantees that a player gets out of the first age on Emperor difficulty or below, no matter how bad the map, no matter how inexperienced the player. I am confident that someone who has only played Chieftain level, can survive Monarch level with this opening (3 warriors, settler, 3 more warriors, 2nd settler, plant settlers very close to capital). The player may not win, but will survive through the first age and probably be ready to win after a few games with what he learns.