Well, I have certainly used the benefit of the IMCR during early instructional flights.
Rather than bouncing around in the murk below clag attempting to teach the basics of attitude flying, 5 min to VMC on top with smooth air and a ruler straight horizon was a much better option.
I have deliberately taken a weaker student on a dual cross-country in less-than-ideal conditions to prove to her that 'heading and time' flown accurately and backed up with one or two landmark fixes actually works.
DFC, your posts are becoming increasingly weak and biased. Fortunately others are taking a more constructive approach - including the CEO of AOPA UK about whom you were so rude.