I have used Diamond Force on at least 5 occasions in the last couple years.

I must admit, it is a nice perk, but I do feel bad if I force others to walk.

I personally have been walked twice as a Diamond as well though. Once, they had given away all of the non-smoking rooms and the other time they didn't have my HHonors number on file...so, non-status members (as well as status) do in fact get walked.