As had been said before, there are lots of things a toddler doesn't need but we give them anyway when it comes to their diet.
I love the closeness it gives - when my DS is scared of upset I love that I can comfort him so easily by breast feeding him. It's a very special thing. It's also wonderful knowing that if he is ill and refusing all other drinks/foods he will always breastfeed.
The act of breast feeding isn't just about creating a bond with the baby when it is born, it is about creating a strong and secure bond throughout toddlerhood too.
Yes my son probably does favour me over his dad but I imagine a lot of 2 year olds gravitate more towards their mother whether they're bottle fed or not.
I returned to work when DS was 10 months old and due to shift patterns myself and DH pretty much do 50/50 in terms of childcare. Sometimes I'm away from DS for 48-72 hours and in that time my DS is just fine. In fact, in a few weeks my DS and DH are going on holiday together, just the two of us.
Breast feeding a child does not mean the mother's making a rod for her own back or setting herself up to be the default parent.
My DS is at an age where he asks for it, he says: "Mommy milk please" but I don't see why that's any different to a toddler who'd ask for a bottle of milk?
I saw a child the other day in her school uniform with a dummy in her mouth which I'm assuming is to give her comfort and I imagine some people would be more accepting of that than a toddler being breast fed for comfort.