Fencing in villages as soon as I find them seems to do the trick. Although I notice my game lags very badly when a zombie swarm appears along the fence line.
Mining has definitely gotten a lot scarier, with all the monsters becoming a lot more dangerous and doing a lot more damage. I find myself dying a lot more.
My only real gripe with the baby zombies is that they don't catch fire during the day.
For now, I'm hoping to find a Nether Fortress so I can start collecting brewing supplies. Sadly it seems I picked the one spot to build my portal that's totally fortress free.