I've only played my 360 twice since I got my Xbox One. I played it for the first episode of The Walking Dead: Season 2 and a couple of weeks ago when some friends came over to my house to play some Super Street Fighter IV: AE. Other than that, I haven't touched it.
I was financially able to keep my 360 as well which is a good thing as my lad plays Disney Infinity and Rayman Legends amongst other games. Then theres Netflix and streaming videos from the laptop so totally worth keeping a hold of it.
Also got a s*** load of games myself to play on it still but not sure if Ill get a chance to play them.
I had 2 360's, traded one in...use the 360 for the bedroom Netflix and the few games I kept (Skyrim, GTAV)
I'll tell you right now, I'm glad I did... the state of the xbl on the One is embarrassing... there are times when I go to play with my friends... and it won't let us... I promptly turn that trash off and go in the back, and hop right online...