Yes, queries and arrays in CF are 1-based.
The CurrentRow and RecordCount variables are properties of the query (inside a query loop they are automatically scoped).
<cfloop query="QueryName">...</cfloop>
will loop through the entire query*, from 1 to QueryName.RecordCount
, and the QueryName.CurrentRow
index is automatically populated/incremented appropriately. Its value prior to query loop isn't used.
*(unless cfbreak/etc used)
Also to point out there is generally no need to prevent reading past the end (as above, the query loop handles it), it's only because CurrentRow+1 is being used that it's needed to avoid an error.