Yes it is, pain in the neck.
Well, technically Z shouldn't be height, should it?
It is a bit of a pain though, if you're used to Z being up.
But just remember the size of a plate in Torque units (0.5 0.5 0.2, as said above), and it'll be easier to determine the size.
ALTHOUGH if you do a search the same size as the brick, it'll also include the neighbouring bricks if you don't make the search a little smaller.