Honestly, as I was growing up, my mother has never kept an indoor cat. I would definitely keep indoor cats in a city, but the area we live in is quite small, about 2000 people. I'm still at my mother's for my last 3 or so months before University - excited for that! - and my mother refuses to keep a strictly indoor cat in her home. Just the way she is I suppose. Kaden really only goes outside to relieve himself though, he prefers it to his litter box I think. He's generally back inside within 5 minutes.
By the time it's warm enough for him to want to go outside again, I'll most likely be living somewhere that I'll be able to have him indoors, or even need to keep him indoors. And after the winter he should be pretty used to it