Agreed, SpaceBridge. I did 4 days last year, and I thought that was overkill, so I did 3 this time. I was burnt out by yesterday. I went today to check anything else I've missed. Ended up getting a few more of those Killzone figures, since the Sony people were pretty much giving them to everyone. Got 7 months of PS+ in total now.
I didn't initially plan on going on Friday, but I was already there picking up my tickets for yesterday and today, so I figured I might as well go in. Pretty underwhelming, and it soured even further with that whole Stan Lee thing.
I think I'll stick to one or two days next year. I was thinking Thursday and Saturday if two, Saturday if one.