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.
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.