Nevermind. It would appear that even though I had the settings all set up, Adaptive Formatting had to see enough files to discover it for itself and thus enable it.
Now if only I could get rid of the dumb popup to select a keyword when I key in "o <space>" (yes, I named a local variable "o") and not have it insert "StringReader" for "String" when I'm keying in a CType() call and key the end-parens -- as in CType(foo, String) expands to CType(foo, StringReader) when I type the close parens.