Or do you mean that the name Easter, and a lot of the non-religious customs surrounding Easter, grew out of pagan celebrations? As in, "Fine, keep your spring rabbit party--hell, we'll even let you keep the name Eostre--but now you have to make it about Jesus"? Okay, no bone to pick.
This is a common understanding, yes.
So, today we have some pagans doing Easter stuff for their reasons -as some of them had always done- some atheists doing Easter stuff for their reasons, some Christians doing Easter stuff for their reasons, some others doing Easter stuff for their reasons...and also plenty of Christians doing passover, celebration of the resurrection, etc, but not doing Easter.
Jooni -- usually you are right on or have a creative insight, but I think you are just twisted up and so utterly wrong about this one.
Easter (or Paschka, or whatever), is a Christian holiday, that coincides with Passover because the event celebrated is tied to Passover. in fact, it is the single most important Christian holiday, so getting it twisted up / wrong is kind of a big deal.
Spring equinox (and various pagan celebrations) is a completely different thing, on a different date, pagans / celts etc. are not doing Easter stuff, they are doing their equinox stuff. So is commercial celebration of Easter that looks a lot more like a commercial celebration of Valentine's Day than anything else. The fact that the commercial celebration grabbed onto a date that was already a national holiday, (because it was such an important religious holiday to so many citizens a century ago), well, that commercial date is just for convenience and marketing / money purposes.
I have never heard of Christians doing passover but not easter... that is pretty much not possible, by definition.
On another note:
As for symbolism -- it is interesting to note that the egg is a classic (orthodox) symbol of Christian renewal and rebirth that resulted from an empty tomb.
Rabbits - not sure... They are cute, common in the Spring, and the Peter Rabbit story about handing out treats to his friends was well received in English speaking countries. Perhaps adapted, like Santa Claus, by those marketing companies.