But the set of people who avoid using C-style for loop are typically the ones that avoid $# as well.

I do use the C style for loop if I want the index, because, IMO, it's easier to avoid off-by-one errors than using foreach style. The latter means you either have to use '- 1', or remember to use '$#'.

for (my $i = 0; $i < @array; $i++) {...}
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is standard idiom which translates easily between languages. Both

foreach my $i (0 .. @array - 1) {...}
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and

foreach my $i (0 .. $#array) {...}
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feel artificial, and Perl specific to me. And they both have their ugliness (either -1 or $#array).