If you expand a village substantially & villagers populate like crazy, they all condense into one section of the village & leave the other parts abandoned. Most of the time, I will see about 20 villagers crammed into a fenced area. They also like to cram into the tiniest houses at night instead of the bigger ones.

On top of this, you end up with too many golems. They bump into eachother & get suck in fenced areas & around wells.

I don't have any suggestions, but it would be great if golems wouldn't spawn in peaceful mode, where they're not necessary. Or maybe make them easy to kill in creative mode.

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18w44a: Superflat village. Villagers spawning in leaves. Always clustering in large groups in small areas of large villages. Golems either still getting in the way or not spawning in the village at all.  Created a superflat world years ago with leaves intentionally on every square, because it's fun to dig the villages out. In the more current versions of the game, the villages spawn on top of the leaves instead of inside, & the villagers spawn underneath the houses in the leaves.