I explained presentism to my 11-year-old daughter. I told her that according to presentism past and future events aren't real and reality is three-dimensional. She found this view scary. It made her think we live in something like a "flat world", something akin to a "two-dimensional" world. I take it her worry was that this impoverished the world, in much the way that denying a spatial dimension would. Her emotional reaction to presentism is much like mine is: presentism contracts the world to something way too thin.
My daughter then connected this with Zeno's paradox of the arrow. I think her thought might have been something like this: The eternalist can say that movement is what happens in virtue of the arrow being in different places at different times. But according to the presentist, the arrow is where it is, and that's that: that's all of reality. So presentism denies real change (which is ironic since presentists are largely motivated by the idea of saving change).
Now all this isn't entirely fair to the presentist. The presentist does not deny that the arrow was elsewhere and will be elsewhere. Still, "was" and "will be" are operators akin to modal ones like "can be". The fact that the arrow was elsewhere is related to the fact that the arrow is here in something like the way that the fact that the arrow could be elsewhere is related to that fact. Being in different places at different times ends up being akin to one's position being contingent. And that doesn't seem to do justice to the reality of motion. This is all suggestive, though it's probably not much of a knockdown argument.