Re. using camelCase for subs, it is for the very reason stated above -- "different things should look different." That way subRoutines() look different $from_variables.

But they already look different! Tell me what each of these are:

foobar()
$foobar
@foobar
%foobar
[download]

To distinguish them more, I would probably have the subs named with some kind of action, like process_rows(\@rows) (as opposed to rows(\@rows), which is begging for trouble).

But then I really hate camelCase. I'd prefer camel_case, Camel_Case, and CamelCase before camelCase.