As a former resident of New Jersey, I'm aware of Abbott districts, and trying to place the blame them for NJ's high property taxes is absurd. It's not a separate tax, it's simply redistributing school funds from existing tax income. As for the amounts of funding the districts get, here's what it says in the wiki article:
Abbott district students received 22% more per pupil (at $20,859) vs. non-Abbott districts (at $17,051) in 2011.
That is a HUGE amount of money being spent regardless of district classification. As for the pension problem, please do not underestimate the ability of the NJ government to kick that can down the road as hard as they can. I firmly believe that they will do anything they can to not solve it until it's too late.