I'm not good at articulating but here is my attempt, over the past several years I have had this question and have been able to answer it for myself but haven't been able to hear what others think about it, I have never asked but I have never heard others in church lessons give the answer.
So, in D&C 130 it says basically the reason the Holy Ghost is a spirit personage is so He could dwell in us. Before discovering the revisions of this text( http://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=4458&context=byusq), I felt that, yes it's true the Holy Ghost could dwell in us but why would he, he is just one being and can only be in one place at one time just like God the Father and Jesus Christ. I do except the explanation that He is like the Sun where the sun's light can be felt. I believe the answer I concluded with "dwelling in us" phrase is a figurative phrase which is used to simplify the mystery of God and maybe to only give Glory to God because my possible answer is that Angels speak by the power of the Holy Ghost, so I think that the Holy Ghost uses Angels to fulfill His mission, and the danger is to give Glory to Angels and not to God, so we figuratively say we're filled with the Holy Ghost and not with Angels (spirit Angels of course and not resurrected ones although I'm sure a resurrected Angel could speak to our spirit). If you could let me know your thoughts and help correct any of my understanding like a check and balance I'd appreciate the feedback.
Great explanation of the Spirit below.
-Roma e Remo
The Holy Ghost can appear as a spirit personage, like he did to Nephi. I would assume that just like Heavenly Father and Jesus Christ, that appearance would be limited to one place at a time. However, D&C 130:22 teaches that the Holy Ghost is a spirit so that He can dwell within us, implying that that's something Heavenly Father and Jesus Christ cannot do as resurrected beings.
Opinion: The spirit of the Holy Ghost can be omnipresent, thus allowing us to have the companionship of a God and a channel of communication with the Godhead. Something about being a Spirit lets Him be everywhere He needs to be. That's what it feels like to me anyway, having gotten to know Him over the years. Angels, although very real and very important, are not perfect and cannot replace the vital role of the Holy Ghost.
I like what Ronald E. Bartholomew, in the article you mentioned above states, "this exegesis shows that the phrase 'Were it not so, the Holy Ghost could not dwell in us' rather than referring to the literal indwelling of the Holy Ghost in each individual Saint, which Joseph Smith's teachings indicate is not possible, actually refers to the fact that the Holy Ghost dwells in 'us' as a body of Saints, or in the Church membership as a whole."
I basically agree with Bartholomew's conclusion.
-Sunday Night Banter