Mcdonald’s new beverage-centric, drive-through-only concept CosMc’s has proven to be wildly popular at its one and only pilot location in a Chicago suburb, Bolingbrook Illinois. The drive-thru-only concept offers a Starbucks-meets-Sonic menu, featuring fruity and coffee-flavored slushes and drinks. CosMc’s saw double the visits of a normal, new McDonald’s, and…