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You're right - PCC 3.0 won't be at all like QE2. I'll be interested to hear afterwards which you would rather do again.
Oh I have no doubt which is going to be the most fun, even before going on the Disney cruise. Besides, that QE2 cruise was before I was married and had a family to share the cruise with. That alone would make the Disney cruise many times better, in addition to all there is to do on DCL! And it's almost here!!