The whole PS+ thing has been mentioned by others.  I know I could add Resogun, Strider, Mercenary Kings, and quite a few others to my list if I didn't have PS+.  

Also, I can only speak for myself and my buying habits, but a good majority of indies are also available on PC.  And I will generally get multiplats on PC. Games like Trine 2, Outlast, and Child of Light, I own on PC.  And I'll be holding out for the PC version of No Man's Sky.  Much like retail games, which I will always get for PC first.  The situation would be the same if I owned an XBone.

Anyways, my list: Killzone, Knack, Infamous....with Destiny on the way.

CoD Ghosts through the $10 upgrade thing (copy is my brothers)
MGS: GZ
inFamous SS
The Last of Us:R

I also bought Killzone and NBA2k14 but have sold them.

bought:
- Killzone Shadow Fall (sold it later)
- inFAMOUS: Second Son
- The Last of Us: Remastered
- Oddworld: New 'n' Tasty
- Entwined (Cross-buy)
- Escape Plan (Cross-buy)
- FEZ (Cross-buy)
- Flower (Cross-buy)
- SoundShapes (Cross-buy)
- SteamWorld Dig (Cross-buy)

pre-ordered:
- DriveClub

rented (each for a week):
- MGS: Ground Zeroes
- Watch_Dogs
- Knack

PS+ downloads: Resogun, Contrast, Don't Starve, Outlast, Dead Nation, Mercenary Kings, Trine 2, PixelJunk Shooter Ultimate, Stick it to the Man!, TowerFall Ascension, Strider, Doki Doki Universe

I will probably buy "Transistor" and "inFAMOUS: First Light" next.

PS4

Assassins Creed IV: Black Flag + DLC Freedom Cry
Contrast
Tomb Raider: Definitive Edition
Infamous: Second Son
Watch Dogs
Last Of Us Remastered
Oddworld: Abe's Oddysee - New 'n' Tasty

PS4

Assassins Creed
Killzone
Battlefield 4
Watch Dogs
Madden 25
Ground Zeroes
Infamous Second Son
Warframe (F2P but not PSPlus)
Blacklight Retribution (same)
Warthunder (same)

Next will be Destiny.

PS4:
Killzone SF
Knack
Infamous SS
Tomb Raider
Lego Marvel
Call of Duty: Ghost
Injustice (8 bucks on ps+)
The Last of Us
Entwined
Rayman

FF14 ARR

Plus all the Free indies from Plus since day one

Xbox One;

TitanFall
Dead Rising 3

WiiU:
Super Mario 3D world
Mario Kart 8
Zelda WW HD
New Luigi Bros U
Wiiu sports game cant remember the name
old school snes mario from the nintendo network

Hmmm i think thats it

PlayStation 4:
Call of Duty: Ghosts (€10 upgrade)
Assassin's Creed IV: Black Flag
Trials Fusion
The Last of Us Remastered
inFAMOUS: Second Son

Things I might buy:
No Man's Sky
Call of Duty: Advanced Warfare
Grand Theft Auto V
inFAMOUS: First Light
Mortal Kombat X

Bought:

-AC4

-Forza 5

-Halo Spartain Assault

-Titanfall

-PvZ: Garden Warfare

-Tomb Raider

Got from GwG:

-Max: CoB

-Guacamele

-Crimson Dragon

-Strike Suit Zero

I pre-ordered a PS4 and received it at launch. I have bought one game for it- Madden 25 and its one I could have bought for my PS3.

By contrast I have over 80 retail games for my PS3.

To say I am underwhelmed by this generation so far is an understatement.

Day 1 buy for the PS4; order included (retail):

Assassin's Creed 4 (unfinished)
Killzone Shadow Fall (unfinished)
Battlefield 4 (unfinished)

Post launch (retail)

Infamous Second Son (2 play throughs)
MGS V: Zeroes (basic campaign played)
TLoU Remastered (in progress)

Digital

Injustice: Gods Among Us Ultimate
Another World