This whole "Well, I did {something that at the time was normal but is now considered reckless/unsafe} and I survived OK train of thought.
Seatbelts, bike helmets, the social acceptability of driving drunk, all of us of a certain age lived through these things. Saying that this proves that these actions were safe is idiotic.
Just because you survived without wearing one while you were young doesn't mean that doing so isn't dangerous, just that you're one of the survivors, the others aren't around to talk about it. Granted, they'd be in the minority, but their absence should be deafening.
A full-face might not be needed all the time, but for the few times it's used, it's invaluable. My 5yr old rides probably more than a lot of people on this board, and I can't count the number of times he's uses the full face aspect of his helmet. It's not only saved him from countless chipped teeth, facial scars and broken noses, but also kept him interested in his bike and possibly saved him from much worse effects of hard crashes.
Bottom line, get a FF and don't listen to the non-parents. You, your dentist, your wife, and especially your kid will thank you.
POC makes a small light one, it's far from cheap though. You can also look at a Bell Bellistic, they're relatively light and a lot less $$.