If you spend any time on this board, you are probably imagining that everyone is going to make reservations on the 27th. I look at it this way...the fanatic folks who frequent this board (or boards just like this) likely make up a small percentage of patrons who frequent Disney. The majority of folks who are going to Disney probably are not going to scramble to make reservations on the first possible day. I told some folks at work that I woke up at 4:00am to make ADRs for my last trip and they looked at me like I lost my freakin' mind!
If Disney's computers get bogged down, it won't be because everyone is making their ADRs. It will be because Diseny's computers in general are slow, cumbersome, and generally sucktastic.
Good luck.