In my past life as a retail florist, I wired roses in some circumstances, not because of fear of drooping heads, but because as some of you pointed out, to keep the heads from popping of in rough handling. In fact, one sign of really fresh, high quality flowers is a nice crisp stem, which may allow the heavy rose head to snap off just below the calyx.
I would simply insert a wire through the calyx then bend it down like a hair pin, and wrap tape to cover it. It was done for roses that would stick out of designs, such as funeral sprays or wide fans of roses in standing baskets, or in a large cascade wedding bouquet. Just a little extra assurance for any roses at risk of getting their heads knocked off. My staff and I never considered it a real bother, it is just part of "fussing" with flowers, which is what we are paid for!