Macs have lovely POSIX-compatible terminals, but many of the standard tools are different from Linux. So it goes.
The equivalent to lsusb is
system_profiler SPUSBDataType
.
Now, if only the GUI would actually update for me when I try to do it graphically. I guess that's a lesson to me: If you're developing with the command line, stick with the command line, that's what it's for, that's why the mac has it.