Very true. There is no such thing as a .45 LC. It is simply the .45 Colt. BUT, with the .45 ACP (Automatic Colt Pistol) floating around, some folks can get confused. Many, if not most folks refer to the revolver round as the Long Colt to avoid confusion.
Nicknames and misnomers abound in the gun world. I have never seen an M-16 cambered in .223 but many people refer to them by that caliber. Is an M-14 a .308? Why is a .22 LR when fired through a pistol still called a "long rifle"?
I personally do not get too excited about "long" being used with the Colt, but to each his own.