My post office knows what I send too. They haven't seemed to care, except one lady always makes a comment about loving orchids - so I gave her a couple. She's really nice and very friendly, and I haven't had a problem since!
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Really, I've never had a problem, but now we get to talk orchids when I come in the the PO.
littlefrog, I think you are right. They all seem to get the same treatment regardless of any special care instructions. The carriers are used to seeing their own 'Perishable' and 'Fragile' stamps, so I don't think that calls too much attention. It's better than nothing, I think. Interesting discussion.