A good meeting point at Spiel would be the AMIGO D&D booth. AMIGO usually has a
huge area covered and is therefore easy to see and hard to miss. Also, it's in one of the first exhibition halls, so you can't really get lost before getting there (Spiel takes place over 8-12 halls, I'm not sure).
Other booths are harder to find if you've never been there.
A possible meeting point could also be the open space between the halls (that's where the live-Rpgamers meet, too), but it's not that defined a space, so I could see running up to people asking whether they're from ENWorld.
I will be there on Thursday, probably, or perhaps Friday. I'm thinking about going there again on Sat/Sun, but am still undecided, as I have some engagements going on. Otoh, I would have to take a holiday for going Thursday...
It's usually no problem going to Spiel without speaking German. There are a lot of English and Netherlands vendors there, and of course some Americans. English is usually a viable option even at German booths - though not always
Being the biggest European Games Fair, it's bound to have a little cosmopolitan audience, and the vendors know that.