We were a party of 9 in March of this year and almost all of the reservations were split as 4/5s or 6/3s. There was only one instance, at Be Our Guest, where they were unable to accommodate us and seat everyone together, even at Space 220. All of the reservations were within 20 minutes of each other and we just showed up earlier than the first reservation, checked in in person, and asked politely. We were always prepared to be told that it wasn't possible (except my mom who had to be talked off the edge at BOG when she pointed out every large table that was vacant but clearly already reserved), and were fortunate that it worked out almost all the time.
Even last week we were a party of 7 and the one reservation that was split we were able to be seated together by simply asking.