Do you have a pamphlet? Or in other words, I'm thinking of going all out and getting a Titan at 1080p @ 120Hz and would like to hear more of your experiences

Have you posted in the Titan owner's thread by any chance?
I've been having oddities with how the boost and clocks work, but that has settled now I know it clocks really well. It's just something new.
It really depends how fussy you are with having a smooth frame rate, that's what these cards do extremely well. The card allows me to almost, max games and keep my high frame rates.
Like in Far Cry 3. With the 680 I would set it to ultra, but turn off alpha coverage and MSAA and use SSAO. With the Titan I can enable HBAO, MSAA and it still feels like I have a higher frame rate, even with vsync enabled.
Tomb Raider is much improved for me too. Real AA is now usable (although it doesnt make much difference to FXAA in this one).
Max Payne 3 is an absolute joy now, everything just gets turned up without worry.
No SLI profiles to worry about, and none of those very slight stutters I have always witnessed with multi-GPU. It's not really a "stutter", more of a frame clarity issue when turning in FPS games and what not. Hard to describe.
As for Crossfire, i've never liked it. Some games feel like you have mouse acceleration turned on, then there's less control over profiles without 3rd party apps. It's meant to have improved this gen though, but I don't know. I am pretty sure I would still come up against the same issues.
I switched my 570 SLI to a 680 last time and even though the bench numbers seemed to drop, actual gameplay improved tenfold.
If I had a 60hz screen I would probably stick with the 680. It's this 120hz lark that convinced me to go Titan and I don't regret it.