I think I can speak with some expertise on this subject after having flown literally hundreds of flights with my now 7 year-old daughter (who hit 1K at 2 years old) and my spouse having done so even more on her own. Parents with an under 2 year old don't need extra time to board. It's not that hard. You do have to be organized and make some effort. But I view that as the parents' responsibility, not that of the other passengers.