Ohmygod yes! It was my first time there as well and I actually loved it.
I went with three friends and it was just so huge and overwhelming and more than I expected! Although my boyfriend described it as 'a shop where you pay to get in'.
Did you buy anything there? I got some badges, an oyster card holder, 2 posters, a keyring, and a couple of other little things I think...
Haha I may have seen you, did you dress up or anything?