I'll definitely bring one to a BBQ and often wish I brought one to a restaurant if I didn't. A lot of places serve your steak with a proper steak knife, but enough don't. You're then stuck waiting for a while before you get one or getting one that isn't much better than the butter knife they gave you.
In the city I'm pretty unlikely to whip out a bushcraft or survival knife in a restaurant, also not a great decision to pull out the Opinel No.13, but a good stainless steel folder wouldn't frighten too many people. If you're with a date, who also ordered steak, it would be poor form to only bring out a knife for yourself.