I am married, have a 3 year old kid.
My wife, while not against what I do, follows under the "dont ask, dont tell" guidelines. She doesnt want to see what I pay for games etc and I always have my family budget come first. This is mainly due to I re-invest money I make from buying extras etc back into buying what I want.
She isnt a huge gamer but enjoys watching me play some games, she works at a game store (which I got her the job a while back, however I no longer work for) so enjoys my feedback and uses me as go-to insight or knowledge to help her perform her job better. I had a small collection, more so what I had left over from when I was younger when we started dating, however if I did play anything it was mostly PC games. This was about 9 years ago. She has made comments at how staggering my collection is now, but honestly thinks it looks neat that I keep it organized and orderly, especially with the use of this site and making cases versus loose carts everywhere. I keep everything in a separate room, a mancave of sorts, so she doesn't have to stare at it all day.
I work an overnight job, take college courses online and am a dad and husband, its a lot to juggle, and thus my game time isn't near what it used to be. I still play often but usually when everything else for the day is accomplished and we have spent some time together. I have done some ridiculous things to get a deal and she has actually encouraged it as she knows its something that truly gets me excited.
Several people have mentioned balance, which is true, if your partner is supportive or at the very least can deal with your hobby, they should expect the same in return.