Yes. Front pillars are thicker both for airbags, and also for crush/rollover protection, and rear visibility is bad because the beltline has increased, for crash protection and also for aerodynamics. Basically, cars now are MUCH safer than they were 10-20 years ago with these changes, but like anything, there's a price to pay, and it's visibility.

Luckily, rear cameras and radar sensors give me much better visibility now than I ever had with older cars that had more glass.