First let me preface by saying, I've lived in NYC for over 40 years and witnessed alot of change over the years. Something about Queens, it never went through the gentrification as did lower manhattan and many parts of coastal Brooklyn, esp in the NW. Lots of pizzerias which opened past 10 years or so, now serve kinds of pizza that nobody ate in NYC 20 years ago. Secondly, there is something to be said about neighborhoods that saw very little change in the past few decades, like flushing (outside of the chinatown area), and elmhurst and continue to mostly serve the locals, and not transplants. And for that reason, you can still find original NY pizza in these neighborhoods..
I refer to 3 places as standards which to me represent the true NY slice as they were.
Amore Pizza in downtown Flushing.
Louie's Pizza in Elmhurst. The best grandma slice in all the boroughs
Lucia Pizza in downtown Flushing.