You description doesn't tell that the elements are shuffled the way your example code says.
if consecutive elements and destroying the original array are OK, try splice
DB<32> use Data::Dump qw/dd/
DB<33> @a=1..12; dd { map { $_ => [splice @a,0,3] } 1..4 }
{ 1 => [1, 2, 3], 2 => [4, 5, 6], 3 => [7, 8, 9], 4 => [10, 11, 12] }
+...
NB: the case where @a/4 is not an integer is more complicated.
HTH! :)
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