So many things to miss
1) The upgrades -paid or free.
2) the flight credits. as someone who flies a lot on the east coast, I don't accumulate as many miles domestically.
3) more direct flight choices from ATL
4) the cheap fares: though this has been less frequent since WN took over. I used to fly on quite a few spontaneous trips with those two week advance fares of 70-100 bucks each way. In fact, I have stopped taking spontaneous trips that I doubt I will retain A List for 2016.