I feel like the poll should have a 20-200 option
For instance; for a while I was really enjoying Magic World 2, which only has about 60 mods.
Now I'm playing BnB, which has 100+ mods
I also played Monster for a little while, which had like 175 mods
And my personal pack I'm making has about 195 mods.
As for dimensions, of I know, there is
Twilight Forest - Twilight Forest dimension, based around nature and forests. Adds bosses, monsters, and neat utility tools.
Tropicraft - Tropical dimension, based around islands, fishing. Adds a new villager type, a new village, and a bunch of monsters. Also adds a new toolset.
Dimensional Doors - Puzzle dimensions, also the Limbo which has a really awesome looking block.
Erebus - Bug/desert based, adds terrifying gigantic bugs
MystCraft - Custom dimensions
Extra Utilities - Deep Dark - Mining world.