Berghain has quite a few regulars. I don't know so much what the mix there inside is anymore. I went a handful of times in its earlier years, and never really loved the place, but haven't been back since the last 2-3 times I waited in the line I didn't get in (which never happened before). There's kind of two poles in Berlin techno style and aesthetics kind of represented by Berghain and Kater / Bar 25, and I was always more in the Bar 25 camp. Berghain is very dark and industrial; Kater is more playful with lots of bright colors and odd objects. The music coming out of their labels is different in the same way.

I think the yelling at tourists is mainly going to be if you're doing something stupid (though some of those are non-obvious: e.g. taking pictures in clubs is mostly a no-no). I probably wouldn't mess with trying to get in to Berghain. Other places you'll have a decent shot. If you want to go like a pro, show up from 4-6 a.m. instead of midnight with the tourists. The pros come out late, and the lines are shorter and the dancefloors are less packed -- if you actually like to dance, later is better. I'll sometimes even go out on Sunday afternoon.

My understanding is that Tresor was destroyed and any current one with the same name isn't 'the' Tresor club. Berghain seems like it's the real successor there, and Berghain is not tourist accessible, it's about as easy to get in as Studio 54 in its heyday.

It's not about just line length, you would have to fit in and seem non-tourist to get into Berghain, and then you'd need to actually enjoy a dark, brutal, kink and techno club full of intentional degeneracy. I would absolutely go, for the music, but wouldn't be as much into the kink side, which I think is escalated somewhat from what Tresor was?

There's a good documentary on the history of Tresor: "Sub Berlin - The Story Of Tresor" which appears to even have a re-cut version on youtube: https://www.youtube.com/watch?v=iiuJhq-z2LE