I just made a reservation for the Plaza this week. Also, the WDW website still lists it as taking reservations. I don't think the premise of this thread (that they've stopped taking ressies) is valid.
While I don't think ADRs should be bookable 6 months in advance (I think 3 months in advance would be more reasonable) I'm glad we don't have to wait until day-of.
I wouldn't find anything enjoyable about wandering around the parks, from restaurant to restaurant, trying to find something with an opening for a meal with a reasonable wait. Yuck! Or having my nose buried in my phone during the trip, trying to find out where we'll eat each day. Double yuck!
One reason I like having a meal or two per day planned in advance is that I don't have to worry about it during the trip. We can relax and enjoy ourselves, fully taking in our surroundings, without wondering where/how we'll be able to find a nice restaurant for our next meal. We've taken care of that in advance, so that day-of, when we're focused on the magic & enjoying ourselves, all we have to do is show up.