There's no reason why all (or any) of your bikes have to have disc brakes. I have four bikes with discs, three with rim brakes, and I never even think about them; I just grab the bike that's suited for that day's route and go. My actual riding experience has never once been compromised by the kind of brakes I'm using.
To be fair, I vastly prefer disc brakes on my mountain bike, but that's just one bike and one discipline. My cantilever CX bikes and my V-brake cruiser aren't going anywhere.