I've never had trouble finding FTers -- even without luggage tags. On airports known for their "mileage run worthy" flights, I go to the nearest AC or FL and wandering around asking if there are any FTers present. Of course, I always make sure my FT luggage tag is visible, so people won't think I'm stalking them.
Great meeting all of you on the ORD/FRA flight -- it was a hoot!!!