Is it big enough to get lost In?

Absolutely. Even with a map at the PAX Prime event, I struggled to figure out where I was and how to get to where I wanted to go over the 6 floors of space in the main center and 4 more of the annex

Yes for sure

Yes you will get lost when big events are going on you might see something try to find it again and can't. It takes going there a few times to know where your at and going . There's lots of people there to help you get to where you wanna go. It awesome there go every chance you get

Yes it is