I don't get to big airports that often...
....but when I do, I really appreciate the fact IFly has the geo-referenced airport diagrams and photographs of them so I don't get LOST on the ground.
Before you laugh, how many have been taxiing around Dulles, Baltimore-Washington or any of the New York Airports?
They can be complicated!
In many cases, the ground taxi clearance is as complicated as a IFR departure clearance or STAR arrival clearance with modifications...THANKS iFly!