As a traditionalist who used to say “Holy Ghost” all the time, I understand the reasoning. I don’t like to use it anymore, though, given that the original Latin is “
Spiritus Sanctus”. We should be as close to original etymological foundations as possible, when it comes to inspired Scripture & Tradition. “Holy Spirit”, “Saint Esprit”, and “Spirito Santo” form a sort of sacramental unity across the world.
“Ghost” has come to be so strongly associated with silly superstitions that the holy solemnity can be lost in the giggles of others. “Holy Spirit” comes close to the meaning of breath, wind, or soul. The oldest names for the Divine Person are “Spirit of God”, and “Spirit of Christ”, indicating the very inner life of God/Christ. From the Hebrew
Ruach, we should maintain consistency…
The Orthodox use “Holy Spirit” almost unanimously in their English liturgies, and no irreverence results from that.