The vast(!!) majority of all US casinos use bridge sized cards, they are easier to handle for dealers and players. Yes, the Peacock cards are pricey, but they ship from India. Just think of a slick Bicycle card that is cut and centered correctly. That's something that USPCC has proven themselves incapable of.
At least here in the States, casinos still use poker-sized cards for most games like blackjack and baccarat, where players aren't handling the cards as much. The switch to bridge-sized cards is really just at the poker table. The ones used are also plastic, for more durability and less ease of marking. Texas Hold 'Em players find it's easier to conceal their peeks from fellow players on the smaller cards. The last casino with card games I went into was Firelake, near Oklahoma City, only about two or three years ago - they still used Bee Stingers in poker size everywhere.
It has nothing to do with easier handling. Most Western adult males find handling bridge-sized cards a little more difficult because of the size relative to their hands, and also because they've become very accustomed to using poker-sized since bridge-sized aren't as common outside of Congress cards and some plastic decks.
If I walked to a pharmacy, grocery, newsstand or stationery in my area, they'd carry only poker-sized decks more often than not, with the top three available brands being, in order, Bicycle, Bee and Tally Ho. Occasionally you'll find Bikes in bridge-sized or a two-deck set of some no-name brand bridge cards, but they're sold out more often than not because they're stocked in much smaller quantities.