Two different things!
Escaping the dollar means that variable interpolation won't happen and only literal '$zoek' can match.
quotemeta on the other hand escapes regex metas after inserting the content of $zoek
"zoek" is Dutch for "search" and is literal user input via Tk. But a $ in input is also a meta which needs to be quoted.
DB<2> p 'a' =~ /$x/
DB<3> p 'a' =~ /\Q$x/
DB<4> p '.' =~ /\Q$x/
DB<5> p '.' =~ /$x/
DB<6> p '.' =~ /\$x/
DB<7> p '$x' =~ /\$x/
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