perlop says the following about some of the quote-like operators:

Customary      Generic    Meaning        Interpolates
''                      q{}          Literal           no
""                     qq{}        Literal           yes
``                    qx{}        Command     yes*
                        qw{}       Word list       no
                        qr{}         Pattern         yes*
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Talking from experience, many programmers tend to use [] for qw, {} for q or qq or vice versa and etc. And they make "steel" rules about their own kind of quoting, the problem is that the other colleagues rarely know or remember those rules, because they have thier own or don't case (and why should they) or do not use those operators.

But does it make any sense, isn't it it much better if everyone uses these operators exactly in the way they are described in Perl manuals?

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