Search gives you a list of results. Go is the “I know what I want” button.
Type a statute number (83.49), a rule (Fla. R. Civ. P. 1.540, or 16-5-1 for O.C.G.A.), a reporter citation (415 S.E.2d 615, 410 U.S. 113) or a case name (Roe v. Wade), and Go takes you straight there.
More than one case answers to that name? You get a short pick list instead of a guess. A citation that doesn’t resolve gets checked, and Go suggests the closest pages it can find.
If nothing matches, Go falls back to an ordinary search and says so.