I think balance can mean different things at different times. During weekdays, I go to work, so I don't wear diapers. I might wear during the evening, but often it feels like more trouble than it's worth when I'm tired and I'll only wear to bed because I like the feeling of sleeping in them. If I'm going out weekends, I usually don't wear, though I've started getting braver and every once in a while I'll go out to some activity or cultural thing diapered (though only if I don't expect it to last more than a few hours, I don't carry around any sort of bag, so changing is not happening). Other times, I have a free weekend and the opportunity to spend a whole day diapered, which can be nice a couple times a month. When I get busier, like if I have dates, conferences, or travel, I typically am not diapered, although as with going out, I've gotten a bit braver about slipping a couple diapers into my suitcase, and I did attend one day of a conference diapered last spring, which was fun (it was a free day though, I didn't have to meet up with anyone I knew, just attend various panels).
As far as the broader question though, I don't think that there has to be such a strict demarcation between Big and Little. Just because I'm dressed like a baby doesn't mean I'm not going to do the dishes or answer my email if something important comes in. And just because I'm dressed like an adult doesn't mean I won't get excited about getting icecream or seeing some really cute animal while I'm out and about.