Does anybody actually use Big Picture?

nope

Nah.

I do when playing co-op, but without a controller? no

Why would someone use it without a controller? but some friends of mine uses this with a controller

Nope

Yeah, sometimes when I feel really lazy I get my controller out and launch up big picture mode.
Don't actually know why exactly, but I guess it must be something like "less buttons == less thinking".
Also it limits the amount of games I can choose from, so I come to a decision much faster :D.

sometimes

No, not without a controller.
But i do use it with my controller all the time ;)

Not sure why you added the "Without a controller?" part, most PC gamers do have one.

I tried clicking on it once but it didn't work .

Only with Controller. On my tv..
Also... how would steam work without PC? xD

Not without a controller, no.

with controller

I used to but it got buggier in one of the Steam updates so I just stopped. I might start using it again if it's fixed. I like the fluidity of it and it usually has less errors and is faster than the Steam client. There's no point in using it to quickly launch a game unless you're using a controller, but it's a nicer browsing experience.

I don't use a controller so no, but it I like the interface.

It doesn't work on win XP. Seems to be pointless anyway since I don't have and don't need a TV with my great monitor.

I've noticed Alienware have been advertising one of their PCs as a console/pc by setting it up like a console, on big picture with a tv and controller, I guess to try and appeal to console gamers, which I think is a really clever idea. Some people do seem to be using it in this way as well, with their own pcs, I've seen quite a few comments saying so.

Sometimes :) but it crashes a lot :(

Nope, i actually hate it

Makes steam overlay crash constantly, damn annoying

No, I mean I do try it from time to time but its really lags on me. I'm not sure why..

If I had a big TV (which I will have when I move from home, I'll burn my PC screen and use the TV instead) then I would definately use it, it's 1000X more beautiful then the regular interface, but of course it's adapted to controller use, and it's illogical to use it with a keyboard.

Nope.

Wanted but too much crash so I did not use it

Only when I'm lazy to get out of bed, I just start it up, then I can browse steam and start my games with my controller directly from bed :D

I have my PC hooked up to my TV, so I don't see the point.