I'm also coming from the Pre, and excited to see what Android can offer me.
I was a first day Pre girl, then a first day Evo girl. I was a super-WebOS fan and still like the card idea but the day I got my Evo, I honestly never looked back. I love my phone and the only reason that I am upgrading to the 3D is because I really need more internal memory, want more RAM and the faster, dual core processor. I love the form factor and Android. The only thing I'll miss will be the kickstand.
Trust me, your move to the 3D will make you an Android lover. My phone really does everything that I need it too - there hasn't been a time when I said, "man I wish that app or tweak was available for my Evo, whereas I said it quite often about my Pre (maybe WebOS has gotten better since then though).