Bolivar was definitely famous for the rapid movement of his army, which heavily relied on his knowledge of the South American terrain and the mobility of Llanero cavalry (José Antonio Páez, one of the Comandante Generales, was from the Llanero ranks; he was technically a cowboy general). Bolivar himself was a skilled raider respected by many Llaneros.
However, it's not like Bolivar or Llaneros can keep with that speed outside South America, which is
@PhoenicianGold's argument: "the +1 bonus should be limited to GC's home continent."
The revolutionaries certainly done well in terms of the speed, but having every unit get a plain, universal, unrestricted +1 movement is a bit too much.
Alexander also rapidly conquered the vast territories stretching from Egypt to India, should he receive a unrestricted +1 as well? And what about Genghis Khan in terms of speed?