Or, are you just getting lost? You poor soul.
No, but everyone else bloody well is, especially pubbing. Place needs more arrows!
But regardless of its actual size it certainly feels a lot bigger than other maps, probably because of all the vertical you get. Even with your standard TF2 map being largely outdoors, there's rarely anything to draw your visual attention upwards, so the ceiling feels a lot lower. Foundry, there's action if not just decoration at so many vertical levels that you're made aware of them all.