Unless talking with the men's shaving "elite" who may beg to differ, aftershaves have generally fallen from favour since aftershave balms came on to the market. Where once a man would splash his aftershave on after shaving (drying out his skin in the process), we've since come to recognise that moisturizing is far more beneficial.
Aftershaves contain a lower ratio of perfume oil to EDTs, and I do not believe that re-applying a splash in the same spot will do a whole lot towards increasing its strength or longevity. Certainly if you were to douse yourself, it would be noticed - but would eventually disappear in typical cologne fashion. EDTs are favoured for their higher oil concentration.
The splashes I own (which have been given to me as gifts) I tend to decant into a small atomizer and carry with me for a quick spritz during the day where perhaps excessive fragrance application may be inappropriate.