At my airline we are authorized Cat 111A, and we're asked to be configured, spooled up, all checklists completed and everything else by the FAF. Nothing less than that for all operators, right?
The problem with some guys, because they're shooting CAT 11 or CAT111 approaches they intercept the glide at 3000 feet for instance, drop everything and reduce to approach speed in a flash, so I can imagine the controller's headache trying to bring the next airplane in for the approach when one guy flies minimum speed at 3000 feet while another one does from at 1500.
Above the FAF altitude, we are not really more busy than during CAT 1 weather. Please don't make it sound more difficult than it is. Below 1000 feet, it's different, I could not agree more.
Cheers!!