To me, it's quite a varying experience. I had a girlfriend who is rather interested in my hobby - asking questions like "what is FSAA" and "why do you prefer GeForce 6800 instead of the newer 9800" (hint: because the former supports Windows 98). I also had a girlfriend who despises my obsession with old games and old hardware, calling it "totally irresponsible, childish behavior".
Heck, I even got contrasting experiences from the same girlfriend. At first, she was fascinated with computer games, watching me play Quest for Glory 4 1/2 and laughing at the game's humor.
Several weeks later, she was in the shower and inviting me to join her. I replied with "hmmm... a minute..." because I was busy playing Heroes III of Might and Magic. Minutes later, she was in the towel, shivering, and so angry at me because I left her shivering alone in a cold shower.
(on her defense , sharing bodily warmth in a cold shower is something we loved to do, and it was actually my idea to begin with. 🙁 )