I didn't really find that prices had gone up, but I think we have to accept it if they do. All the tavernas/restaurants are having to pay more for everything this year and if they don't reflect it in their prices, it isn't worth their while working.
I found that for two of us with a starter, main course and a carafe of wine it was between 25 and 30 euros for two, which is really very reasonable in my view.