How to deal with Steam backlogs?

Stop getting new games , spent an hour or two each day on your backlog , lastly , quit SteamGifts (i kid :P)

You could try http://www.nextsteamgame.com/ and do what it tells you to. :P

One game at a time.
Or two or three at a time.
Four at a time just gets complicated.
With five at a time, at least one will always get lost in the shuffle.
Six or more at a time: you're fooling yourself. You're not going to finish any of them.

EDIT: (Also, I suppose a "backlog" post from me wouldn't be complete without a link to the Backloggery.)
EDIT2: As McJobless wrote, pull the infinite multiplayer games out of the list (if you use Backloggery, make them "Null")
EDIT3: From your list, the ones I've played that I think are must-finish games are Portal 2, Sleeping Dogs, and Deus Ex: HR. Unfortunately, they're all rather lengthy. Also, Half-Life: Lost Coast is extremely short, so you can cross that one off your backlog very quickly (as I recall, no significant HL2 story spoilers are in Lost Coast, at least none more than are already in HL2 promo screenshots -- a few types of the basic baddies).

Don't buy games that you don't feel like playing.

Make a group about it.

Don't treat is as backlogs; Treat it as a library, where you can check-in and return any games at any time at your leisure.

go to library > select a game > click play game > GG

I have about 170 games on this PC (Steam and other), and I made a list of my backlog, which was about 65%. I can't help myself buying new games either, so I broke it up. Any multplayer games or games like Minecraft/Garry's Mod get thrown off the list. Any games I've started but haven't finished I put to the top of the list. I make a schedule every week, and I usually aim to get about 5 or so hours a week in to these games, and when holidays come around I go nuts.

Sometimes you'll also want to play games you like, for example when I redo F.E.A.R. for the second time or KotORII. That's alright, just remember to keep having fun with your games. If anything gets boring, put it off, play something else and come back later. It's what I do when Deus Ex or System Shock 2 become too frustrating at difficult points.

Cry.

Got a Green Man Gaming account? Start beating those unbeaten games and then write reviews for the site. Each accepted review is 25 cents credit to spend on the site. Then you can use that to get more games. :D

Fap

Well,after about 20min of deliberating I was able to pick a game and launch Fallout : New Vegas. I had forgotten how fun this was!

PS: (How about a rehab for steam addicts?)

delete them from yor library by contacting the steam support and your worries will be deleted with them.
(note: the deletion of games results in permanent deletion - no refunds - no cookies)

Man, I have a few games that I haven't played once. I don't have your problem of buying games constantly, though.

You kill them, with a flaming passion.

I sink all of my time into Binding of Isaac despite having a fairly extensive library spanning three consoles. I feel you, bruh.

I know that feel, bro. I've got games spread out over generations of consoles I haven't touched, whether it's from being busy with school, or how some of them (looking at you, Destroy All Humans, Death by Degrees, and Sonic Colors, among a few others) refuse to work, along with many other excuses. :P

But yeah, you can always use The Backloggery to try and keep track of your collection. It is a bit tedious to use at times, and it can be a pain to add DLC onto a game (especially if you mix up the names in the wrong places), but it's still a well-done backlog tracker, with a handy "what-game-should-I-play-next?" generator.

Its like its me but its you. I forced my self to play one hour of the game it picked.

Since we started our backlog crusade in our group I've completed like 20 games. We started it back in May so not too bad in my opinion. A few games did get tedious but it feels good to get through them. I have a way bigger backlog than you though so I'll be working on it for a long time.

My solution is to buy more games.

Right now I'm trying to finish Cherry Tree High Comedy Club. My friend gave it to me as a joke and now I have to play it because it's eating my soul. It's also not very comedic.

Stop complaining until you have more games.

I have 550 games and dont have time to play most of them.

Buy games for beggars

You don't. Trying to finish your backlog is like quitting drinking or joining the gym on New's Year.