It seems so. They hinted a couple of times that they might open ATH-AMS, but I doubt it will happen now that the summer schedule has started.

I'm flying through CDG to ATH these days, but it is quite a pain. Last time I flew KL direct it was very crowded, however that was just a few days before easter so the stats might be off on that one. One thing is sure though: Prices have gone through the roof. Where KL flights used to start at 220 euro last year, they are now at least 300+. (Also for the winter season).