I've never heard this line from a real creationist, only ever as a strawman. Anyway, as far as I recall they don't (officially) have any problems with fossils like this. They'll just say the split happened during the Flood, like everything else.
The amount of energy it takes to split two continents and send them thousands of miles away from each other would be enough to boil off the oceans. Just think of the incredible amount of rock that has to be melted and resolidified (all of the rock in the rock floor between the two continents, or that was previously elsewhere). And resolidifying means releasing heat.
Yeah, this simply can't happen in just hundreds of years.
If the initial premise is that an all powerful being created, well, everything. I am not sure that arguing the specifics of how manipulating continents is physically demanding is going to sway hearts and minds.
Creation scientists actually do go pretty far, though, in trying to make things as physically plausible as they can. I think they're aiming for a theory where God makes specific events happen, like creation itself, or unleashing water in the ground and air to generate the Flood, but aside from that physics pretty much runs as designed. And to their credit, this would be sort of a local minimum in divine interference required for the theory... if the rest of the physics worked.
Ed: though I suppose that implies less than it ideally would about the attitudes of random believers on the street, who might well be a lot less principled about where they let divine interference into their model...
I subscribe to Bertrand Russell's hypothesis that the earth was created five minutes ago. Events that you remember do not necessarily have to have happened; memories were put in our minds. Impossible to prove wrong.
