Cushioned, motorized reclining seats with footrests. Thick armrests so that you have a little personal space from your neighbors. And, they still got the drink holders. Quite different than the cheaper plastic seats from two decades ago.
Id like to add in on this, there are more dine in theaters than there use to be. Big one in my area would be thluie Alamo Draft House. Quality isnt what it use to be, but is still better than most.
They also tend to reshow alot of older movies, will never forget seeing the original Predator movie and they were handing you a kids cap gun with a pack of the round ring of ammo on your way to the seats.