[FA] = Fully Automatic:
All automatic, no clicking on button, collecting into chests automatically, not need to plant again.
Just take it from inside the chests when you need it.

[BA] = Button-Activated:
Need to click a button and collect.

Bamboo: [FA]
Plant at the first time: 150
Get for every automatic harvest: 280-300
Very big and ugly - recommended to build under the ground to hide it...

Cocoa: [BA]
Plant: 1 stack
Get: 3 stacks (-1 stack to plant again) = 128 (2 stacks)
Need to plant again.

Wheat: [BA]
Plant: 80 seeds
Get: 80 wheat + ~2.5 stacks of seeds (-80 seeds to plant again)
Need to plant again.

Carrot: [BA]
Plant: 80
Get: ~160 (-80 to plant again) = ~80
Need to plant again.

Potato: [BA]
Plant: 80
Get: ~160 (-80 to plant again) = ~80
Need to plant again.

Cacti: [BA]
Plant: 41
Get: 123 (-41 to plant again) = 82
Need to plant again.

Pumpkin: [BA]
Plant at the first time: 40
Get: 40
Not need to plant again.

Pumpkin: [FA]
Plant at the first time: 14
Get for every automatic harvest: 14

Melon: [BA]
Plant at the first time: 40
Get: almost 3 stacks (or 40 melon blocks if you break it with enchanted (silk touch) pickaxe.
Not need to plant again.

Melon: [FA]
Plant at the first time: 14
Get for every automatic harvest: ~64

Nether wart: [BA]
Plant: 160
Get: 370-400 (-160 to plant again) = 210-240
Need to plant again.

Monster Farm: [FA]
Not using spawners
Especially big chance of catching zombies (the villagers do their job!)
Can't kill spiders/cave spiders/silverfish/bats
Build in a dark place, not far from the place you're usually in. For 24 hours working monsters fam build it under the ground and dig a room around it (recommended to dig 15 blocks to every side of the trap, room's height: 3, the place around the trap must be dry!)