Man, doing more than 8 months of floors (including ICU time) especially if most of that time if spent on a standard hospital-like rotation (as opposed to sub-specialty consults or something) seems brutal. I've heard the horror stories about NYC prelims (mainly the lack of supportive nurses/ancillary staff that has already been mentioned) but I'd never guess that they'd have you do 10 months of floor work.
The whole bit about treating prelims differently than categoricals would be a huge issue for me.
However, if you are dead-set on being in NYC for your prelim, then I imagine that you're willing to put up with these issues. As an aside, does anyone know if these same issues affect NY state prelims outside of NYC? The NY nurses union is state-wide, but I only hear horror stories about NYC nurses generally being less useful, leading to excessive scut and micromanaging on the resident's part.