Using words like "sane" and "cryptic" and "incantations" doesn't really seem to fit an argument in good faith, but assuming you're sincere, I can explain.

Perl uses sigils for two reasons. First, to provide a separate namespace for variables and language keywords. Second, to allow amount contexts.

Reasonable people will disagree about the value of both of those reasons, but those are the reasons why sigils exist in Perl.