The FDA is in the rule making process for nutrition information on Menus. If you like I feel that carbohydrate information is valuable consider submitting a comment here. Now is the time to speak up to be heard. Public comment is open to September 7.
Carb counting is a key part of living with type 1. Well of any insulin user's life Type 1 or type 2. Taking some of the guess work out of carb counts on menus is valuable information that make that balance easier.
You can read there Questions and Answers Regarding Implementation of the Menu Labeling Provisions of Section 4205 of the Patient Protection and Affordable Care Act of 2010 by clicking this link.
Much of the document deals with calories but paragraph C sub section 7 does list total carbohydrate as other nutrition information.