It is frequently speculated that the reason the pope's shoes and liturgical sandalia are -- traditionally -- ornamented by a cross on top of the toe of the shoe was precisely related to this reverential custom -- so that the cross might be kissed. It is thought this development came about during the middle ages "to show that the honour was done 'not to the mortal [i.e. the person of the pope himself], but to the Son of God.'" (Handbook to Christian and Ecclesiastical Rome, Part IV, pp. 341-2)
In point of fact, the kissing of this cross on the foot of the pontiff was only part of the ceremonial reverences offered to the office of the Vicar of Christ:
In being presented to the Pope three genuflections are made, one at the door of his chamber, another midway, and the third before kissing the cross on his slipper. Here at his feet you remain kneeling, unless he tells you to rise, and to be seated. On leaving, three genuflections are again made, and you retire without turning your back, and consequently walking backwards. (Urbs et Orbis: Or the Pope as Bishop and Pontiff, p. 129.)
Evidently, in the current milieu within Western society, such actions are frequently either misinterpreted or maligned, being considered overly monarchical and aristocratic -- and therefore either passé if not outright undesirable. However, one wonders if this is less the result of a considered view on the origins and symbolic purpose of this act, and more a case of temporal and political ideologies and ideas imposing themselves upon something that had as its purpose the reverence for a spiritual office?
We'll leave it to our readers to have that decide for themselves.