I've always had cats in the house, even as a kid. Our family has pretty much always followed the "They get breakfast when we get breakfast, and dinner at dinner time" so that's when they get a portion of "wet" food, with dry/crunchy available to "free feed" on throughout the day if they get snackish as well as a few different sources of water.

While that can lead to cats being overweight, we generally let the cats outdoors or now more recently, give them free reign of the house and attached garage. The garage is basically just a building shell, so critters like rodents and birds can still come in which in turn gives the cats something to do and keeps them active which is the key. As long as they're burning off the extra calories and maintaining a healthy weight, the "how" becomes somewhat irrelevant.

The general advice that seems to be prevalent though is to intentionally restrict their diets a bit to keep them at a healthy weight. So the "free feed" idea may not be the best advice.