I spent the whole day over at Gabby's place. 本句,副词 over 表示“距离感”,指某一地方( Gabby's place)离说话人居住地有一定的距离,或者指两地之间有一定的距离。我们常说,Go over there. Come over here. Go over to the station. 等,都是表达这层意思。正如网友所言,这些 over 不要,句子也讲得通。又如:
You really should come over and see our new house.