Any mom who has breastfed knows that, well, it's not as easy as it looks. In the earliest stages there can be problems with your baby latching on. It takes an enormous time commitment (on top of everything that is new parenthood). It's difficult to breastfeed if you are going back to work (you'll have to pump, and some workplaces still don't have adequate facilities for pumping moms). And you likely won't sleep for more than three hours at a time for as long as you're doing it.
And those are just the practical concerns. Add in society's seemingly endless enthusiasm for judging new and seasoned moms for breastfeeding in public, and you've got the potential for causing some serious pearl-clutching, even if you don't end up on the cover of a national magazine because you dare to breastfeed your toddler, or make headlines because, horror of horrors, you fed your hungry baby in public.
But given all of this, breastfeeding moms are a resilient bunch, and that's a good thing. The rewards of nursing to mom and baby are significant.