One caveat on visiting a new, gun-free Starbucks; There will be several persons in each store that will be doing "pat-downs" obviously checking for hidden firearms. Do NOT be fooled. It's those wacky gay guys pouncing on a great opportunity.
Also, the owner of Starbucks has threatened to fire any employee that openly states, "Are you packing or are you just glad to see me?"
See? Stupid rules have must more stupid outcomes.