With Rage moving to Curse, many changes occured.  A number of mods were removed which not only took away some 'things to do' but made things a little less hellish.

Removed
EnviroMine: no more falling blocks, dying of thirst or even going crazy underground!
Zombie Infection: so changing into a zombie? Not happening!
Hunger Overhaul: dont worry, you wont be starving when you respawn.
Monster Swarm: atleast they cant break into your base now.... right?

Others removed:
Forestry
Railcraft
Buildcraft
Thaumcraft
Baubles
Metallurgy
PneumaticCraft
ProjectRed

Others Added:
EvilCraft: things just got... creepier
Blood Magic: Will you make the sacrafice?
Hardcore Wither: so wait... they are smarter now??
Immersive Engineering: Early power is now possible!
Magneticraft: Multiblock and fancy machines!
Modular Powersuits: Something to protect you!
Prayers: Will Notch save you?