A third-party idea is Vuescan. It supports 32/64 bit and can function as a standalone or Twain driver with features not found in WIA and with support for many scanner models. You can download an eval version for MacOS or Windows and see if it's your fit.
I agree with theking2, WIA is lacking for some and Vuescan might just be the ticket.
I have no relation to Vuescan other than being a satisfied customer.