The 'advantage' of paying back (or at least paying interest) is that you can actually deduct the interest from your income during taxes. The moment you make more than 110k, the student interest deduction falls away. Now, that doesn't help you if don't have enough money to put food on the table, but it is a factor to consider.
I have lived on a residents salary in one of those cities, and it is not easy to spare substantial amounts of money for payments. The main factor is the cost of a place to live and if you have a car the cost to park and insure the car. Depending on where you go, not keeping a car might be a way to have the money to pay loan interest. The frustrating thing about deferment/forbearance is that with the extra debt you accumulate, you end up with a couple of extra years of payback.