I was interested to read this thread. My ATC unit encourages ATCOs to do at least one fam. flight per year as part of our annual TRUCE (TRaining in Unusual Circumstances & Emergencies). They are always arranged between unit management & the Ops. dept. of the airline concerned.
Having flown on the jumpseats of many aircraft types over the years, I have always been politely received & find the experience very useful & enjoyable. I would say that most ATCOs are well aware that a jumpseat ride is a privilege not a right in this post 9/11 world.
Putting faces to voices can only be a good thing!