I have seen WOC by collecting a FP first thing in the morning, and with a picnic lunch. I preferred the picnic lunch BY FAR and this is why:
The waiting at the entrance, rushing through turnstyles, rushing to GRR, rushing to get a FP (all while getting pushed around by other mad rushers) made me really anxious. I SO SO SO wanted a Blue FP, so I knew I needed to be there first thing. It was a really nerve-wracking experience and that left me on edge for a good while after. There's also the fact that you are going to have to go through a similar sort of rush-rush-push-push situation later that night too.
The 2nd time I saw WOC I pre-ordered the picnics. I wanted the 2nd show, so I reserved those. To better ensure a blue FP, I collected the picnics as soon as I could(11:30am) and had an early lunch. This way, I could arrive at DCA after seeing DL for the morning, not have to waste time waiting in line before the park opened, and totally skip the pushing and shoving for the morning. We got our blue FPs, the picnic was yummy(I had the kids lunchbox classic), and we only had one crazy line to stand in for WOC. All of those reasons made it worth the 13.99(AP price) for me.